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Stuck valve sbc

After the truck warms up you can hear a ticking under the valve cover, I was told it may be a stuck lifter and try and flush my engine. Vise grips locked around valve stem could not move them. ) then check with compressed air to see if the valve is stuck open. they are not even near each other. It worked. The thermostat in your car is responsible for controlling the amount of coolant released into your engine. 3L, 5. engine last ran 3 weeks ago. Below are some before and after pictures of cleaning up the exhaust valves and the wire brush wheel I used. Maintain a clean, efficient cooling system so the engine does not run too hot, use good quality fuels to help prevent carbon build up on the valve seats, and have your mechanic regularly check the valve clearances are within specifications. Has anyone tried using Stiction Treatment in their oil To unstick a stuck or collasped lifter. My experience was that I had a stuck valve which in turn caused the lifter to collapse. Valve guides … every engine has ’em and if you’re refurbishing a cylinder head, you’re going to have to remove them. Stuck valves can have serious consequences on engine performance and engine life. At any rate fresh air reaching the exhaust valve is bad news. Although it sounds like a minor issue, this tiny valve can cause numerous problems — even engine failure. when i went to start the car the other day, it ran really rough so i shut it down. Exhaust valves not effected. As we learned in the opening page for the car AC section of the fix my old ride. As is widely known, the most important aspect of selecting a valve spring is to get a spring with the correct seat pressure, open pressure, and spring rate for the cam in the engine and with the rev limit that will be used kept in mind. EGR Valve Pintle Stuck Open Due to Carbon Buildup. Apr 21, 2015 Confirming a stuck EGR valve can be as simple at giving it a light tap on the side of the valve, which may free it from its stuck-open position. Slide the valve up through the valve guide and through the valve seal. Some of the toughest vehicle components to diagnosis are ABS/ESC Hydraulic Control Units (HCU). e seat to fail and consequently, the valves; To help prevent this type of failure, there are a few things you can do. com. It was fine after that. Instead of paying a mechanic to fix your car's stuck valve for you, follow these four steps to rectify the problem This tutorial addresses a very common problem I've seen on the 1987-1995 GM 4. A housing gasket needs to be able to seal fully, and it won't if it's been used. I have not taken the head down yet to see exactly what the problem is but I surmise it is a stuck valve. oil pump chevy 5. Warranty: OEM Valve spring compressor service tool package · Lisle Valve keeper Proform 1. These Baffled Valve Covers are the Short style 2 5/8" and feature a 350 Logo Design Pressed into them. may notice a steady loss of vacuum at idle if a valve is burnt or sticking. This involves a process of elimination, usually starting from the simple, easy-to-check items, then moving on to more difficult items in logical sequence. To be more specific Valve Spring Tech. It wouldn't hurt to spray the other valve stems while the valve covers are off. The better way to approach this when you have a stuck engine would be this way: Determine what is stuck. Happened during start up. GM Turbo 350 Transmission Rebuild Troubleshooting Guide Troubleshooting is the step-by step process where you can logically diagnose a problem. I hope nothing ever goes wrong with it. 02 sbc heads sbc valve spring kit sbc valve springs sbc valves 2. 350 sbc in my 41 poncho. My way to check for sticking valve is to hold a good size bolt to the top of the valve stem and tap the bolt firmly with a hammer (straight down, don't bend the valve stem!) You can feel the spring give if the valve is not stuck. Valves open and close, allowing compression for the power stroke and the release of exhaust  2 days ago A stuck valveis one that no longer slides readily in its guide. When the IMT valve is open, the intake manifold is configured to one large plenum. i tried a bunch of crap but can't get the valve to balance and o'reillys doesn't carry a new valve. This valve design prevents overheating, and any potential hose or seal bursts. The thermostat and housing together cost less than $20. If you have a stuck engine valve, your vehicle won’t run like it should. If one cylinder is down (possibly no 4. So a stuck relief valve could cause the symptoms you’ve described (low oil pressure, noise). 7 ltr. Valve lash, which is the clearance between the tip of the rocker arm and valve stem tip, is a delicate balancing act between durability and maximum power. what was idle oil pressure? pull the pump and remove the valve and see whats going on. Pushrod being too long or too short can make the rocker roller go too far off the front or the back of the valve stem and can pop the caps loose. Learn what does P0796 Chevrolet Pressure Control Solenoid Valve 3 Stuck Off means, location and how to repair? On cars that sat for a few weeks some had stuck intake valves when returned to service. Checked the compression. 050-inch. Why do valve lifters get stuck? How come they unstick by themselves? this tapping sound with stuck valve lifters. My setup is the PCV in the passenger valve cover and a K&N oil breather/filter in the driver's side valve cover. Unscrew the cap on the top of the valve and pull out the valve. There are four notches in each piston for valve clearance. #3 & 5 inlet valves stuck, resulting in two very bent pushrods. The PCV system is relatively simple. This freed up the stuck valve(s). By Deanna Sclar. I would like to add more information on how to free up a stuck piston and rings in a 1-cylinder engine. If going through the trouble of changing out your valve stem seals. you could try changing the oil and use a good conditioner like BG product. And when the EGR valve gets stuck open, it'll cause a rough idle condition that may hard to diagnose. Here is a list of typical symptoms related to the automatic transmission shifter stuck. Valve lash is defined as the mechanical clearance between the tip of the rocker arm and the valve stem tip. Apparently the engine builder mistakenly set the lash with two feeler gauges stuck together. All was fine at first but when the  Oct 1, 2009 Now it has a rapping noise that I think is a stuck lifter. How the PCV system works. it worked for him. When half-stuck the driver experiences lowered or a complete loss of pressure; a common symptom of this occurrence is difficulty while steering with the engine in idle. you just have to keep it running or it will stall with you. do yourself a favor and upgrade to a viton seal: Hot Rod gives you the 101 on valvesprings and gives you what you need to know about valvesprings. The gas in the exhaust pipe can move back and forth in both directions even though there’s a net flow outward. If there is a bypass valve in the engine block, can this go bad, and are there any symptoms too look for, when I change my oil and I take off the oil filter it is full of oil. If you had never seen it done before, installing an intake or exhaust valve could seem difficult. Everyone seems to have a valve adjustment method they are most comfortable with and some of them will work well, but some are an inaccurate valve adjustment method. Valves open and close, allowing compression for the power stroke and the release of exhaust gases. This happened a few months ago, i found the valves locked solid inside the guide. 3. com website, it's the pressure change that makes the air cold. It would be very expensive to fix. the proportioning valve on my k5 is stuck with the rear brakes shut off. It won't let extra oil pressure release itself inside the pump, so the pressure builds and ruptures the oil filter. If a valve stuck open for some reasonit WOULD hit the piston. You'll feel vacuum from the system sucking at your fingertip and notice a momentary idle speed drop of about 40 to 80 rpm. 7 engine. I also blocked off the EGR valve with an egr valve Could I have a bypass valve in the engine block too, since I am sure oil filters come with a bypass valve that is like a spring. Setting valve lash for the first time can seem like a daunting task, but as often as it’s overlooked it’s extremely important to get the best performance out of your engine. Using a small putty knife, remove the old gaskets and thoroughly clean the ridge of the cylinder heads. do try changing and filling the oil first, might fix it, if not: A tapping hydraulic valve lifter is no big worry. The previous carburetor was also stuck in a high idle. com, the official website for Hot Rod Magazine. Done that? OK, now it's time to get out all that varnished fuel so we'll do it the easy way. It is an INTERFERENCE design engine. All the valves came in around . A: Hydraulic lifters can develop sticky internal check valves when oil sludges up from  My speculation was that was because of a stuck thermostat that caused overheating. Seafoam for teh win again! So you used half in your oil and half in the tank? Or did you pull a vacuum line and let it soak? i've put it in the oil and didn't notice much, but putting it through a vacuum line and getting all the white smoke did quite a bit. When your car first starts up, the thermostat is closed and does not allow Here’s a good story illustrating valve-lash dynamics in an engine. Oct 4, 2016 If it is really stuck, spray a little penetrating oil between the vacuum brake booster check valve and the rubber sealing grommet. . Use a piece of paper and diagnose a sticky of stuck engine valve for FREE! Why pay somebody to tell you if you're car's running right or not when you can do it yourself. 0L, and 5. The PCV valve directs these gases back into the combustion chambers via the intake manifold. the local hot rod shop said that it is possible that my hydralic lifter is stuck. The exhaust valve (the smaller of the two valves) in this engine has overheated and lost a chunk of metal, causing the cylinder to lose compression. The rocker tip can make the lash caps pop off if you don't have proper valve train alignment. Plus, we have access to thousands of parts t My 350 5. Repair Information for P0796 Chevrolet code. . Contributed By: Enginebasics. Starts and runs with a bad miss. Setting Valve Lash With A Solid Lifter Camshaft First, check the spec card that came with your cam for the correct valve lash specifications. These precision retainers are specifically designed for positive location when combined with COMP Cams® high-quality valve springs. Valve float occurs when a valve is stuck in between open and closed. If for any reason it gets held up or stuck, then something is not right and you should abort what your doing. Best Answer: i don,t know about these newer cars but my nephew had a older pontiac and he poured transmission fluid down the carburetor to unstick a valve once. Car manufacturers suggest that PCV valves be cleaned or replaced after somewhere between 20,000 to 50,000 miles of driving. This will cause an immediate loss of power. Empty the crankcase completely and fill the engine with diesel (right to the top). 94 valves sbc roller rockers A burnt valve can happen for one of many reasons, but the underlying issue is, the valve is not sealing correctly and allows hot engine gases during the combustion phase to leak past the seal which is formed by the valve and seat. I always thought the lifter should compress fully with the valve still completely closed, then with the lifter resting on it's base the valve should open and close and only when the valve is fully closed the lifter should be let up again, sucking in oil through it's eyelet. , but we’ve rarely touched on how to get the lit The clearance between the valve stem and the guide in the head is a critical dimension. Loosen A Stuck Shut Off Valve There’s nothing worse than getting ready to start a plumbing project only to realize that you can’t turn off the water supply. Ron Quarnstrom had a Ford Windsor on his dyno at R&R Performance that was making pretty good power when he took a break to check the lash. I did not know until I was about to put the valve covers back on after replacing the heads that that particular lifter was not oiling I was in a bind and needing to drive it so it is still that way. now my focus is on the new baby ( or the older one depending how you look at it). this is 1 & 3. That's what I thought a lifter cycle should be, but please correct me Anybody got pointers on tearing down a 5. Although it sounds like a minor issue, this tiny valve can cause numerous problems  The relief valve is stuck in the closed position. Valve Spring Tech. Stiction is normally used in transmissions to remove varnish buildup in automatic transmissions. I'm thinking stuck lifters. In addition, the valves may also become bent by a collision between the valve and piston. Jul 4, 2016 A number of times on the show it has been mentioned that an exhaust system without back pressure can lead to burned valves, notably the  Jul 30, 2019 This leads to valve float. Probably Cause #1: PCV valve / system, (probably the cause of the check engine light) Probably Cause #2: o-ring on the inlet pick-up tube in the pan (possible cause for low pressure) Probable Cause #3: oil pressure relief valve is stuck open (in the pump, thus contributing to low oil pressure) When the automotive AC expansion valve malfunctions the air-conditioning won't blow cold air. Sticky engine valves All the cylinders should read high, with none reading lower than 30 pounds or less than the others. 4. A collapsed lifter has no hydraulic pressure being built up inside. A stuck valvemay refuse to open, or once open it may refuse to close. 7L engines with throttle body fuel injection system: a stuck open EGR valve. If you have a stuck engine valve, your vehicle won't run like it should. Squirt WD40 or some other type of solvent on the valve stem. Place the valve spring around the valve guide. Find CHEVROLET 5. two days ago. Then, open the hood and disconnect the valve from the valve cover and block the end of the valve with your finger. OK Ill admit it I stuck some valves. The easiest way to clean the valves is with a wire brush wheel. Depending on how stuck it is and if the euphonium has not been played in a my car has been sitting for about 4 months. Also note the failed exhaust valve is the same color as the intake valve. Back off the intake rocker arm adjuster and remove any tension from the pushrod. Today we use a positive crankcase ventilation or PCV system to handle this and other task. Page 2 of 2: Diagnosing a Stuck Open EGR Valve (GM 4. If steering trouble occurs, the valve can be half or fully stuck within the valve bore of the pump. With the line removed and capped off it sounds great, no RPM fluctuations. We’ve talked a lot in the past about resizing valve guides, replacing valve guides, knurling valve guides, etc. Putting a Stop to Oil Consumption through the PCV Valve Background Info on the PCV System The PCV is an emissions device that allows the pressure and corrosive gasses in the crankcase to vent, without venting these harmful gasses to the environment. If the EGR valve is leaking to vacuum slightly it can cause a rough idle condition. But you’ve already removed and replaced it. he said to change the oil and start the engine and it will unstick itself. any oil pressure higher than about 65 lbs hot at high engine speed is wasted and pressure that high is very hard on the drive components 2018 Dart Performance Parts Catalog now available. The valve stem was galled. Make sure it is clean and apply valve oil to the valve. How to adjust valves on a chevy smallblock. 7L/350 PCV Valves with V8 Engine Type and get Free Shipping on Orders Over $99 at Summit Racing! Valve spring installed height on seat – minus – (cam lobe lift x times x rocker arm ratio) + plus + valve lash – minus – safety margin = equals = remaining open spring length. unless your guage was completely junk the bypass valve is stuck completely closed. An intake manifold tuning (IMT) valve is used to change the intake manifold plenum configuration. If you notice a bigger rpm drop and the engine idle smooths out, your PCV valve might be stuck open. Plumbing valves have a way of freezing up over time, and that can make it difficult to do even the simplest repairs. ) As stock springs reach their perfor-mance threshold, the condition called valve float occurs. a test light on the wire off the valve shows the switch is tripped also. 0L, 5. It is my hope that this article informs you that there is a relatively easy method to check valve clearances in order to identify tight valves and to Understanding The Reason For Proper Valve Lash. any tips or tricks? thanks alot mark _____ On cars that sat for a few weeks some had stuck intake valves when returned to service. That is, toxic vapors that were created by exhaust gasses leaking past the rings (called “blow-by”) and into the crankcase were simply allowed to flow out of the engine. Valves and lifters function as part of a vehicle's valve system. 7L/350 PCV Valves with V8 Engine Type and get Free Shipping on Orders Over $99 at Summit Racing! PCV Valve, Chevy, Small Block, Each Anybody got pointers on tearing down a 5. There are a several methods for a valve adjustment on a chevy small block engine. 90 lbs one time, zero the next, then 120, then zero. Our selection includes stainless steel intake and exhaust valves from companies like Manley, AFR, Chevrolet Performance, Ford Racing, Dart, Edelbrock, and more. My 350 is stuck at a high idle and will not go down. If the EGR valve is stuck open the engine will not idle. is that true. Equal With designs for 7°, 10° and 11° lock angles, and constructed from steel, lightweight tool steel or titanium, COMP Cams® has a retainer to fit your needs. One of the most common failures for HCUs can be dump/isolation valves that are stuck open. valve spring pressure is required to control the reciprocating valve train mass as it opens and closes the valves (as RPM increase, valve train increase, similar to trying to hold onto a merry-go-round as it turns faster. Most camshafts will come with a cam spec card that has a recommended valve lash setting. GM's fix was a seal kit for the hood to stop the water and pouring GM top engine cleaner down the throttle bodies with the engine running then turn it off and let it sit overnight. In fact, my auto shop teachers use to say, "It’s this part that makes the cold happen". 255 in. I had an issue last year on a SBC marine engine. Since the valve cannot be adjusted, this is a sign of a collapsed lifter. in oil and press the valve to fill them up I got a stuck lifter in my SBC and i know alot of guys say add tranny fluid to your motor to free it up but it could take several hours of engine running to free it up im worried because this lifter barly moves. I would try and look down the spark plug hole, if that valve is stuck down, unless that engine sat for a very long time, i would suspect the valve is bent, or broken, this probably isn't part of your problem with the valve stuck down, but with the lack of zinc in the new oils, the oil passages in the rocker fulcrum wear a ridge in the rocker Nate's 216/235/261 Valve Adjustment Procedures This is a critical, often overlooked part of the tune up of your old GM 6-cylinder engine and it can make a world of difference in how that worn-out engine runs - you may find after doing this adjustment that your old StoveBolt runs so well you decide to ignore the smoking and just run it as is for Solution: The first thing to check is the clicking on the one intake valve. has smoke blowing back into my breather. When the exhaust valve begins to open, stop and adjust that cylinder's intake rocker arm. Too loose and the guide can hold the valve exactly perpendicular to the seat, and both the head of the valve and the seat get beat up. 3L 16-valve engine. Tap valve at the top of the stem and the sides. it might free it up. Diagnosis and Treatment of a Sticky Valve Valve sticking is a very common problem in small aircraft engines and although we have a number of things we can do to prevent this, it still happens. Part Number: 27146. Trust me when I say its ALL ABOUT having the right tool for the j When the thermostat becomes stuck, it is reasonable to simply replace it. Too tight and the valve can stick in the guide when the engine gets hot. 2. It does not have any room on top of the pistons for a stuck valve. Positive Crankcase Understanding History of the PCV – Positive Crankcase Ventilation valve: Before the 1960s car engines were vented to the atmosphere. 02 1. Valve breakage and burning are the two most common causes of valve failure. if i run the motor couldnt this be rounding off my cam? Related: sbc aluminum heads sbc stainless valves sbc valves 2. A "good" exhaust valve that is sealing and holding compression will usually have white or tan colored ash deposits on it. Paid a small fortune to have the engine built with cams and  Sep 13, 2018 Burnt exhaust valves are one of the most common car tribulations that car owners may face once in a while. the motor sounds really bad and i dont want to run it too long any sugestions would be apreciated Stuck valves are a common problem with Chevrolets that are used infrequently or allowed to sit for a long time without the engine being run. in oil and press the valve to fill them up DTC P2070: Intake Manifold Tuning (IMT) Valve Stuck Open. This results in maximum crankcase ventilation. number 1 and 8 aren't right. But could it have been due to leaky exhaust valves? The positive crankcase ventilation or PCV valve is an inexpensive and often . This is the time to soak the piston and cylinder with my mixture of carburetor gum-out and kerosene. Normally you let the engine sit for a few days before starting the restoration process. 2 - Blue Smoke From Exhaust all the time - Stuck PCV Valve If Blue Smoke appears all the time your engine is running then the first thing to check is the PCV (Positive Crankcase Ventilation) Valve. It is responsible for controlling the braking pressure between the front and rear brakes. Is this maybe a stuck valve and if so what do i need to do? - Answered by a verified Chevy Mechanic How to Tell if Your Car's Thermostat Is Stuck Closed. They must  Valves and lifters function as part of a vehicle's valve system. on the older chevy engines with adjustable lifters you could adjust the rockers down some but with these hydraulic lifters about all you can do is replace the lifters. Basically, subtract the total of how much it’s going to move, the lash and the safety margin from the installed spring height. I determined that with the PCV valve hooked up, my SBC 350 will not idle right, it just fluctautes up and down. All COMP Cams® valve lash settings are “hot” settings (set at normal engine operating temperature) but will work for initial start-up as well. It is very likely that you can not run the same length pushrod with the lash caps as you do without them. The main cause of these issues is the valve seats and pintles can become stuck or not seat properly due to debris, corrosion or contaminated brake fluid. When you experience a symptom of a bad transmission valve body, it is very noticeable. If the valve remains open, it will dump oil pressure all of the time, including at idle when pressure is normally at its lowest. The valves have to undergo  Dec 30, 2003 Read the tech article on Setting Valves, brought to you by the experts at Chevy High Performance Magazine. Lifters control the valve movement up and down. These would be a great addition to your classic SBC. Removing EGR Valve to Check To See If It's Stuck Open. 3 to fix a stuck lifter? Again I don't know a ton about AFM besides hearing about stuck lifters. With the #1 Intake valve at FULL LIFT --- This means that you turn the engine by hand until the intake valve on the #1 cylinder is fully open (watch the rocker arm push down on the top of the valve stem, compressing the valve spring until it stops moving downward) --- and adjust the intake valve on "opposite in firing order" cylinder. And that is what we’re talking about today. back in the old days we use to pour transmission fluid down through the carburetor but i would,nd suggest doing it now. A zero reading in a cylinder points to a valve stuck in a wide-open position. How to install Intake and Exhaust Valves . Mercedes Shifter Stuck in Park Problem. But you've already  I'm running an unusual race car: Mercedes 190E with the 2. if it was cyl 5 or cyl 2 & 3, 1 & 2 (two enst to each other), i would agree that perhaps there is a crack somewhere. Hey guys, brand new to the forum. If pressure builds up in the Oil Pan, the PCV Valve allows this pressure to release. Is it the piston(s), the crank, the cam and valve train, the rods, or a combination of all these? Troubleshooting the PCV System. Jan 11, 2019 Most deal with it by either installing a PCV valve or just additional vents. It can be done manually with the crank handle or the starter. The proportioning valve, also called the combination valve, is located in the disc braking system. ) 3. take off valve The positive crankcase ventilation (PCV) valve works to evacuate gas from the crankcase of the engine. Most exhaust Guide and stems showed signs, but only one stuck enough to bend. A PCV valve uses spring pressure to hold the valve in the open position while the engine is off or when there's a drop in manifold vacuum, like during acceleration. This plays a large role in engine efficiency, improving emissions and the overall operation of your vehicle. Request a hard copy or download the digital version. Sometimes valve stick open or closed, causing an engine miss. An exhaust or intake valve that is stuck open or partially open will cause a noticeable drop in cylinder compression. Agreed? Any "best" solution to free them up without pulling down the engine. After checking with the lifter manufacturer, they indicated that possibly there was a small unnoticeable bur on the lifter plunger. in oil pressure above 5,000 rpm on a 600 hp 468ci big-block Chevy. When they start tapping they have failed and what it means is that the rocker arm is hitting the valve stem (or something in the valve trim has too much clearance and is hitting something). crankshaft socket fits Chevy small block V6 and 4 cylinder. Hasn't been out in months. You notice that the shifter is stuck and hesitates to move. 60 sbc titanium valves sbc stainless steel valves sbc 1. Consult your  Apr 25, 2018 Proper piston-to-valve clearance is the difference between a The guinea pig for this story is a big-block Chevy being built by CNC Motorsports. "Its happened again. When the engine exhaust valve becomes stuck open, it can not only lead to the valve burning, but may also cause the valve to become broken if it gets hit by the piston. any tips or tricks? thanks alot mark _____ Top 4 Symptoms. My #3 had a bad exhaust valve. Then place the retainer on top of the spring. Many years ago, they simply vented the pressure into the atmosphere with a road-draft tube and breather cap. but I have a 97 Chevy Tahoe Z71 with a 5. Piston rings and valve guides also leak slightly producing pressure in the crankcase. If you just wound up and smacked it dead center with a ball peen hammer, you would probably just put a hole in it and it would still remain stuck. Chances are that you won’t let it go for too long because it will greatly impact your driving ability and will likely frustrate you while trying to change gears. Tapping lightly on an EGR valve that is sticking will sometimes free it up enough to close completely and allow a smooth idle. You may have  Other symptoms will be dependent upon how badly burn the valve is. Valve stems can stick either permanently or sporadically, due to heavy varnish on the valve stem or weak return springs. Whether you’re replacing broken or fouled valves, adding valves to your new cylinder heads, or stepping up to larger valves, we’ve got just what you need. 7L). take off valve How to adjust valves on a chevy smallblock. This is NOT the time to get aggressive. “But once any length of pipe is in place…I don’t see it” The open end of the pipe (or a leak near the valve) can suck in fresh air when a rarefaction wave reaches it. Tinware: valve cover gaskets, gasket placement glue, valve cover studs, Tip: When replacing your valve cover gaskets, it’s a good time to think about other similar upgrades such as valve covers, breathers, or plug wire retainers. 3L vortec. It has less than 10k on a rebuild. When the IMT valve is closed, the intake manifold is configured to 2 smaller plenums. I ran out of chipped fuel and ran a batch of pellets in one of our big machines. Only at www. valves, and cylinder bores prevents the clay from sticking and giving a false  Image of Valve Installation Tool : Part number 27146. Also, when the thermostat housing is removed, the housing gasket should be replaced even if you're just checking it. Even in a “passive state” the HCU has to keep designated solenoids open or closed to allow the ABS system to be bypassed. hotrod. i. No rattle may show a stuck valve, on many designs, but the valve could rattle  Dec 23, 2015 One is the pvc valve the other I'm guessing is the temp senson sinces it's plug but the one I can't find is the one with the little tube sticking out. Bent an Exhaust valve in short hours. I installed new guide liners and engine pro nitro black valves. Your car starts fine, but when you try to move the shifter into Drive, the car won’t shift. They should slide on to the valve guides with just minor force. (Why? Because when the exhaust valve is just beginning to open, the intake lifter will be on the base circle of the lobe- the correct position for adjusting the intake. rocker looks good, springs are moving nicely (so probably not a stuck valve or lifter. You mentioned So a stuck relief valve could cause the symptoms you've described (low oil pressure, noise). d. stuck valve sbc

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