Adjusting valves on a chevy 350

This is an in depth guide and explanation on adjusting the valve lash on a small block Chevy using the EOIC method.#chevrolet #backtobasics #howto

Nov 10, 2008 ... Just be careful "sensing" the "zero lash" point. It's quite easy to go too far. As you adjust the rocker, twist the push rod back and forth...69chevellesupersport Discussion starter. 816 posts · Joined 2008. #1 · Jan 15, 2010. Just had a 350 rebuilt basically stock other than a 260 cam. Has stock style rockers and nuts to adjust with. Flat tappet hyd cam. The problem is the valves keep getting loose. My builder ran the motor for a hour to break it in good and made sure the cam was ok.Firstly, make sure your engine is cold, and the rocker arms are free from any oil. Secondly, ensure that you have the correct tools, including a feeler gauge, a wrench, and a screwdriver. Lastly, you need to know the firing order of your engine. For a 350 Chevy engine, the firing order is 1-8-4-3-6-5-7-2. Now, let’s get to the valve ...Jan 26, 2022 · This is an in depth guide and explanation on adjusting the valve lash on a small block Chevy using the EOIC method.#chevrolet #backtobasics #howto Just slow the engine down to as slow as it will go and still run. Well, thereabouts. The feeler gauge should slip in and out with a slight drag. Use a valve adjusting tool, if you have one. Make's it much easier. Or, use a short, stout, slotted screwdriver and a box-end wrench. 9/16 best I remember. Then adjust them.Sep 16, 2006 ... Set the balancer on 0 degree with number 1 piston on compression stroke adjust Exhaust Valve on 1, 3, 4, & 8 adjust intake valves on 1, 2, 5, & ...Measure and adjust the clearence when the rocker arm pad is on the bottom of the cam. Check the clearances of numbers 1, 2, 3 and 5 valves by inserting the blade or blades of a feeler gauge between the rocker and valve stem. The clearance is correct when the gauge is a close sliding fit between the two parts.This instructional video describes two different methods of adjusting valves on engines with solid lift camshafts. The video also briefly talks about firing ...

Typically, the lash setting will be slightly larger on the exhaust than the intake. As an example, if your card specifies a valve lash setting of .022-inch, place the appropriate feeler gauge between the top of the valve stem and the rocker arm tip. Then, snug the rocker-arm nut until you begin to feel resistance.Start by making sure lifter is on low step of camshaft- valve completely closed. Tighten nut on rocker arm while spinning pushrods with 2 fingers. When pushrods stops spinning while tightening rocker arm nut go ahead and tighten down another 1/2 to 3/4 turns. Vale is adjusted. Continue on and do all the valves this way.Small Block Chevy Comp Cam (Solid Lift) 294S Roller Rockers 1.6 intakes / 1.5 Exhaust Problem: ... ,7, starting with the exhaust, turn it over until the #1 intake valve just starts to close back up from full open, then adjust #1 exhaust valve, then when #3 intake just starts to close adjust #1 intake, and run 5 & 7 that way, when you get to # 7 ...C3 Tech/Performance - Determining proper valve lash for unknown cam/lifters - Gurus, I've got an unknown cam with unknown solid lifters. ... Chevrolet Corvette Forum Discussion; C3 Corvettes, 1968 - 1982; ... Until today, I had been trying to adjust by ear and feeler gauge with the engine running. I had about 12 lifters set around .020" hot and ...for Chevy 262-400c.i. and 396-454c.i. engines. 9. ... Adjust the valves on each cylinder in this . 4 COMP Cams® 3406 Democrat Rd. Memphis, TN 38118 Phone: (901) 795-2400 Fax: (901) 366-1807 www.compcams.com Part #145 Revised 5/4/12 manner until all valves are adjusted. If the engine has nonadjustable rocker arms, a lifterIt can be frustrating and inconvenient. To adjust the idle on a Chevy 350, you may need to clean the throttle body, adjust the idle screw, or inspect the idle air control valve. Properly diagnosing and addressing these symptoms can help improve the performance and efficiency of your Chevy 350. Checking The Idle Control System

Plug the hose to prevent air leaks. Locate Timing Marks: Find the timing marks on the crankshaft pulley and the timing scale on the engine. Set Engine to Top Dead Center (TDC): Rotate the crankshaft pulley so the "0" on the pulley aligns with the "0" on the timing scale. This sets the engine to TDC for the number one cylinder.To adjust valve lash on a Chevy 350, you’ll need the following tools and materials: Feeler gauge – used to measure the gap between the rocker arm and valve stem. Socket set – to remove the valve covers and adjust the rocker arms. Torque wrench – used to tighten the rocker arm nut to the correct specification.07-20-08 12:15 PM - Post# 1481806. In response to Tabasco. 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. Squirt WD40 or some other type of solvent on the valve stem. Tap valve at the top of the stem and the sides.Testing parameters. Step 1 - Loosen all valves significantly. Step 2 - Run it through the EOIC method, and each time you need to stop and adjust valves, take the pictures of the lobe (s) and lifter (s) you are adjusting. When completely done, go back and show the lash of every valve.Start by making sure lifter is on low step of camshaft- valve completely closed. Tighten nut on rocker arm while spinning pushrods with 2 fingers. When pushrods stops spinning while tightening rocker arm nut go ahead and tighten down another 1/2 to 3/4 turns. Vale is adjusted. Continue on and do all the valves this way.The 1989 Chevrolet 350 small-block engine is a V8 that produced a peak power of 240 horsepower and 340 foot-pounds of torque in its most common installation trim in the Chevrolet C...

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Let's drive together. In this Hagerty DIY, Kyle Smith walks you through the process of adjusting timing on a Chevy small-block engine. Hagerty's DIY series is your handy-dandy, easy-to-use video guide to tackling small projects any classic car or truck owner might encounter during the course of ownership. In most cases, these projects require ...1339 posts · Joined 2005. #5 · Jul 31, 2008. ok, my book says to do the following: "Adjust each valve by backing off the rocker arm nut while feeling for play in the pushrod. when movement is felt, start tightening the rocker arm nut untill all lash (play) is eliminated. this can be dertermined by wiggling the push rod up and down, when you ...I'll show you how to adjust your hydraulic valves or lifters the easy way! This is a very easy method that never fails. This valve adjustment technique wor...well finally got around to getting the work done on this chevy motor so i can reset the valves and get it tuned in

Typically, the lash setting will be slightly larger on the exhaust than the intake. As an example, if your card specifies a valve lash setting of .022-inch, place the appropriate feeler gauge between the top of the valve stem and the rocker arm tip. Then, snug the rocker-arm nut until you begin to feel resistance.Adjusting the Valve Lash with engine running. Chevy 350 TruckTurn the wrench an additional 1/8 – 1/2 turn to set the plunger depth to the proper lifter preload. (see information above) Continue (repeat) this procedure on each of the remaining the valves. Turn off the engine. Remove the oil splash prevention apparatus and re-install the valve cover.Code 15 means the coolant temp sensor is reporting the temp is stuck at -40*. This usually causes an extremely rich mixture or flooding and no starts. This could explain your surging idle. If this truck has the electronic transmission like a 4l60e or 4l80e the faulty coolant or tps reading will definitely affect the transmission. Coolant temp ...This playlist is to help understand how to adjust valves and replace valve springs on a Chevrolet, GM 350 engine, including the 350 crate engine 602 series,To adjust valve lash on a Chevy 350, you'll need the following tools and materials: Feeler gauge - used to measure the gap between the rocker arm and valve stem. Socket set - to remove the valve covers and adjust the rocker arms. Torque wrench - used to tighten the rocker arm nut to the correct specification.Oct 18, 2014 ... I have a 350 with hydraulic lifters stock length push rods and a 249 cam. My lifters after a head change and re tightening the head bolts ...Sep 11, 2011 · 253 posts · Joined 2011. #3 · Sep 11, 2011. After you adjust a valve then turn the motor over, some of the adjusted valves will be pushing down on their lifter. Since there is zero oil pressure the force of the valve spring will collapse the lifter and bleed the oil out. Then as you rotate it over again and that particular lifter is on the ... 51 posts · Joined 2013. #1 · Jan 6, 2013. I'm getting valve chatter under load on my stock 290 hp GM Perfomance 350 crate motor. I have replaced the plugs, plug wires, distributor, and did a full valvetrain check and valve adjustment just in case. Its running a late model Rochestor Quadrajet carb with electric choke.

May 7, 2009 · 4,745. May 7, 2009. #14. Re: Timing and Adjusting Roller Rockers 350 SB 5.7. Ok, Now listen close the small block V8 has both cyl #1, & cyl #6, at top dead center at the same time, when the crank timing mark is at TDC. The camshaft determines which one is going to fire at that time. You must adjust your valves first!

Chevrolet V-8 engine. Number 1 firing position: Intake numbers 1, 2, 5, & 7 as well as exhaust numbers 1, 3, 4, & 8. Turn adjusting nut until all lash is removed. When all play has been removed, turn adjusting nut one more turn. This will place the lifter plunger in the center of its travel.To adjust Chevy 350 valves, start with a cold engine. Rotate the crankshaft to Top Dead Center (TDC) on the compression stroke for the cylinder you're adjusting. Loosen the rocker arm nut, set the valve lash to the recommended spec, and tighten the nut. Repeat for all valves. Whether you're a newbie mechanic or a veteran DIYer, we provide ...Start by making sure lifter is on low step of camshaft- valve completely closed. Tighten nut on rocker arm while spinning pushrods with 2 fingers. When pushrods stops spinning while tightening rocker arm nut go ahead and tighten down another 1/2 to 3/4 turns. Vale is adjusted. Continue on and do all the valves this way.Installing the flat tappet lifters on a small block chevy 350 and then setting the valve lash while explaining the process and talking too much.The valves acutally look good in the pictures, maybe remove one or two from the head and roll the stem on a flat surface, if you see the valve wiggle it is bent. The valves would need something to hit against to be bent, I think. And if that happens there might aswell be a cracked rocker arm or a bent pushrod...Basically as the exhaust valve begins to open, set lash on intake side.Then rotate engine.. As the intake valve opens, then begins to close, as the intake valve is almost closed, set lash on the exhaust valve..This way you know your getting the lifter on the heel of the cam lobe for proper lash adjustment. There are many other ways guys use to ...The lifter will be opposite from the peak of the lobe, on the base circle. You can adjust that valve then. On the base circle part of the lobe you have quite a bit of area before your lifter will be on the ramp, so it's prety easy to keep it accurate. '69 375/396 TR 711 71 06A X22D80. LeMans Blue.94 silverado 1500 5.7 350 tbi loose rocker armThere appears to be 2 distinct schools of thought on how to properly adjust Valves. In my case, a Chevy 427, Hydrolic Lifters and Roller Rockers. ... 1969 Camaro SS 350 LeMans Blue 2015 Z/28 - Red 2 x 1967 R/T's 1977 Power Wagon 1978 Li'l Red Express. Save Share. Like. L. larryh56.Testing parameters. Step 1 - Loosen all valves significantly. Step 2 - Run it through the EOIC method, and each time you need to stop and adjust valves, take the pictures of the lobe (s) and lifter (s) you are adjusting. When completely done, go back and show the lash of every valve.

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Valves. The original Chevy 265-ci small-block began life actuating diminutive 1.72- and 1.50-inch intake and exhaust valves. In the evolution of the small-block, now displacing as much as 454 inches out of a standard deck height block, these big-bore small-blocks can now accommodate up to impressive 2.150- and 1.625-inch valve sizes.1. After engine has been warmed up to operating temperatures, remove valve cover and install a new valve cover gasket ton cylinder head to prevent oil from running out. 2. With engine running at idle speed, back off valve rocker arm nut until rocker arms start to clatter. 3. Turn rocker arm nut down slowly until the clatter just stops.A lash for this grind should be (.008"x 1.7 rocker =) .013" Hot, and is probably why I have damaged several Morel Ultra Pro bushed lifters in a few thousand miles. The cam has now been reground with a clearance ramp of .010" and the lash specified at the valve for that .010" is .016". (.010"x1.7=.017") My suggestion on playing it safe is taking ...Rotate the engine so the number one intake is ¾ of the way closed. Spin the exhaust pushrod to make sure it is free. Once again, insert the proper feeler gauge above the exhaust valve stem and below the rocker tip. You want the fit to be the same as how we checked the intake, snug, not too tight not to loose.i found my valve lash instructions, this is what it says, "after setting lash cold, start and bring to operating temp, due to thermal expansion the lash will now be looser than it was when engine was cold", wouldn't that support the theory of setting them tight vs loose when cold !! Scott. 1967 Chevelle 300 Deluxe. 71' 402 BBC +.03.These valves on my 1965 C10 need adjusting. The one that was real bad was #1 cylinder exhaust side. After it was fixed my truck idled better and didn't rattle.phel69. 1148 posts · Joined 2000. #6 · Jan 13, 2007. DON'T SPIN the pushrods. it is the biggest mistake made when adjusting valves. Wiggle the pushrod UP and DOWNwhile taking up slack in the adjustment. When the up/down slop is gone, you are at 0 lash. Then go 1/4 to 3/4 of a turn more.1990 Chevy 350 v-8, K1500 I'm trying to adjust "pre-load" the valves/lifters. ... How to adjust valves on a chevy small block engine be sure to double click on the U-Tube video links at the bottom of the page to get a better idea of adjusting the lifters. I guess there are about as many ways or procedures of adjusting chevy lifters as there are ...Best Answer. OK. This is for hydraulic lifters. With the valve COMPLETELY closed (at TDC both valves for #1 cylinder are closed) slowly tighten the adjustment nut while spinning the pushrod. You ...Here is a detailed guide on how to adjust valves on a 350 Chevy: Take off the valve covers before carrying out the valve adjustment. Once the cover is off, choose a cylinder you are going to work on. To adjust the intake valve, use your hands to rotate the engine. At the same time, keep your eyes on the exhaust valve of the cylinder.Let’s begin with a review of the small-block’s valvetrain action. The lifter takes the rotary motion of the camshaft lobe and converts the eccentric profile into vertical lift. The pushrod merely extends that lift up to the top of the cylinder head where the rocker arm operates like a simple fulcrum. The lift generated on the pushrod side ...Mar 13, 2022 ... An easy way to adjust valve last in a 1970s chevy 350 small block. ….

2- install or borrow a mechanical oil pressure gauge and test oil pressure. It should be high when its cold, but hot pressures should be 15-20 at idle and up to 70 at higher RPMs. If its below 12 or so at idle and below 50 at redline, its on the verge of being too low and probably the cause for your ticking valves.Unfortunately, I don't have cam specs, as I bought my car turnkey and the seller didn't have the cam card. I'm just curious what a "typical" range should be for valve lash on a big block Chevy. (Iron block, aluminum heads). I checked, and the lash was .036 COLD, which according to my math is about .042 hot. That seems loose no matter what to me.Sold as a set of 8. Mr. Gasket Rocker Arm Oil Deflector Clips. Mr. Gasket rocker arm oil deflector clips keep hot engine oil off of you and your exhaust system by deflecting it down into your rocker arm assembly. This allows you to adjust your valves while your engine is running. They're designed to fit hollow feed-through type pushrods.Learn how to adjust valve clearances easily and accurately with this YouTube video. No special tools or skills required, just follow the simple steps.With the intake valve on the base circle, install the checking pushrod and lengthen it until all the clearance is removed from the system. Determine the length of the pushrod and then add the amount of preload required. A typical LS engine with a performance cam will need a pushrod between 7.350- and 7.400-inch.Don't worry about getting the engine to TDC. Use my method and you'll be done in minutes. Works on ATVs, Mowers, Tractors, Go Karts or any other engine with ...V8 engines, Exhaust Nos. 1, 3, 4 and 8; Intake Nos. 1, 2, 5 and 7. To properly adjust valves, tighten adjusting nut until all lash is eliminated, then tighten nut the specified additional number of turns. On V8-454 / 7.4L engine, tighten nut 3/4 additional turn from zero lash. On all others, tighten nut one full turn from zero lash.Adjusting valves on a hydraulic camshaft. Once the valve is in position following the above procedure turn the adjusting nut until there is zero lash between the push rod and the rocker arm, turn the adjusting nut ½ to ¾ of a turn. You have now put adequate preload into the hydraulic lifter. Adjusting valves on a solid/mechanical camshaft.L05 TBI 350 Idle Air Control Valve Problems, Need help calibrating. I replaced the Idle Air Control Valve and the idle seemed to be rather steady in park and gear for the past 4 months. I recently took the car to the mechanic to get the throttle body gasket replaced because I didn't feel comfortable taking off the throttle body.May 17, 2011 · Start by making sure lifter is on low step of camshaft- valve completely closed. Tighten nut on rocker arm while spinning pushrods with 2 fingers. When pushrods stops spinning while tightening rocker arm nut go ahead and tighten down another 1/2 to 3/4 turns. Vale is adjusted. Continue on and do all the valves this way. Adjusting valves on a chevy 350, if you loosen rocker nut and spring start to come up you are doing it wrong and need to rotate engine until valve spring has no tension on it. when adjusting be EOIC method. as you are tightening nut wiggle pushrod up and down NOT spinning. tighten until all movement has just stopped then 1/4 - 1/2 turn., The thought of having to live with mitral valve prolapse, a condition marked by heart problems and subsequent fatigue symptoms, sounds scary, but the truth is, it can be quite bear..., i found my valve lash instructions, this is what it says, "after setting lash cold, start and bring to operating temp, due to thermal expansion the lash will now be looser than it was when engine was cold", wouldn't that support the theory of setting them tight vs loose when cold !! Scott. 1967 Chevelle 300 Deluxe. 71' 402 BBC +.03., I adjust some of my lifters with the engine running, then ramble on a while about how it didn't fix my noise problem and why., Chevy 350 valve lash adjustment valve cover, This is a tutorial on how to swap out an IAC valve in your 1991 Chevy C1500 pickup. This motor is the 5.7 V8. I am not an expert, I'm a semi professional ama..., Boo.Man.1971. Adjusting one cylinder at a time , watch the exhaust valve on each cylinder to just open and then adjust the intake valve. Adjust the exhaust valve with intake valve almost all the way down or almost all the way open. Adjusting the valves from zero lash , 1/8 turn for short travel lifters and 1/4 to 3/4 for conventional hyd. lifters., V8 engines, Exhaust Nos. 1, 3, 4 and 8; Intake Nos. 1, 2, 5 and 7. To properly adjust valves, tighten adjusting nut until all lash is eliminated, then tighten nut the specified additional number of turns. On V8-454 / 7.4L engine, tighten nut 3/4 additional turn from zero lash. On all others, tighten nut one full turn from zero lash., Jan 17, 2008 ... One other thing...As you back off the valves till they "click" and then tighten back up, as you go beyond "zero lash", the engine will usually&..., 1. Rotate engine until exhaust valve begins to open. This will ensure the intake lifter is on the base circle of the cam. 2. Rotate push rod and tighten rocker arm until you feel it start to drag and then go 1/2 turn more. 3. Then rotate engine until intake valve is completely open and repeat step 2 for the exhaust valve., Index your wrench, tighten additional 3/4. what I do to make it faster and reduces errors is write on the head near intake ports the # of the cylinder and "I" an "E" for the valves. -Mark your balancer in increments of 8 every 45* on a piece of tape. -Start by finding TDC #1 compression stroke. -Adjust valve (#8 E)., 3. Loosen an adjuster nut until the lifter clacks. Go a bit more so that the lifter can fill itself with oil. SLOWLY turn the nut back down until the clack diminishes then stops. 4. Go 1/4 more turn and move on to then next valve. 5. Do this for all 8 valves then go back and turn them ALL down 1/4 more turn each., Hey students listen up- pull #1 plug - bring up to compression + on cyl. #1- adjust valves to repair manual order- no movement on the push rod, forget about spining the pushrod( too Tight). Rotate 360* adjust other valves (#6 compression ). Use shop vac on fuel tank inlet to bring fuel to carb, use VOM to turn distributor for firing ., 1. Remove the valve covers, and pick a cylinder that you are going to set the preload on. 2. Hand rotate the engine in its normal direction of rotation and watch the exhaust valve on that particular cylinder. When the exhaust valve begins to open, stop and adjust that cylinder's intake rocker arm., TCI 350001 GM TH350/TH400 Adjustable Vacuum Modulator Valve made by TCI Automotive, for as low as $27.95. Talk to the experts. Call 800.979.0122, 7am-10pm, everyday. REWARDS. GIFT CARDS. DEALS. TRACK ORDER. HELP CENTER. Shop. Parts. ... Simply adjust the screw inside the vacuum nipple for more or less diaphragm pre-load., The book says to adjust both valves on no1 in this position to zero lash plus half a turn.The valves on no6 would just be rocking. Then following the firing order, adjust both valves of no8 whilst no5 is rocking, no4 whilst no7 is rocking, no3 whilst 2 is rocking, no6 whilst no1 is rocking, no5 whilst 8 is rocking, no 7 whilst 4 is rocking and ..., Too easy. - wah and dry bike, especially under tankard other places dirt can fall from into engine. - let cool overnight. Must be done with engine cold, ambient temp. - Remove valve cover. DO NOT over tighten when you put it back on, you'll pull the threads out of the cam caps. Torque gently., I go over how to find TDC for #1 and the method I use to adjust the valves on a SBC. I have another video that shows how to find TDC. In this video I show ..., It should end up looking like this: Put a deep socket on each end rocker nut and slide the piece over to check dry fit. Adjust or trim as necessary. Now you need a bead of silicone around the perimeter of the opening. Set on with the sockets to locate. Tape it in place and let it dry., Adjusting valves on a hydraulic camshaft. Once the valve is in position following the above procedure turn the adjusting nut until there is zero lash between the push rod and the rocker arm, turn the adjusting nut ½ to ¾ of a turn. You have now put adequate preload into the hydraulic lifter. Adjusting valves on a solid/mechanical camshaft., The easiest way to adjust valves/hydraulic lifters on a Chevy 350 | 1993 Chevy K1500 - YouTube. Word. 4.79K subscribers. Subscribed. 145. 8.7K views 1 year ago #chevy …, Yes it takes longer but it's guarenteed the lifter is sitting on the base circle. Turn the crank until the exhaust valve begins to open. At this point intake side is on the base circle and can be adjusted. Now turn the crank until the intake valve reaches maximum lift and the valve begins to descend., Step 5. Adjust the following rocker arms in the same manner: Intake valves "2, 5, 7" and the exhaust valves "3, 4, 8." Rotate the engine another full turn. The rotor should now be pointing to the number six cylinder. This is the third cylinder from the front on the passenger's side of the engine. Adjust the number six intake and exhaust., 1024 posts · Joined 2014. #14 · Jul 1, 2016. The easiest way to set hyd valve lash is by using the EOIC method. As the exhaust valve is starting to open adjust the intake, as the intake is closing, adjust the exhaust. No need to even look at the TDC marks on the balancer because it doesn't matter., Typically a 350 will run about 60-65 psi at idle, but there are variations in PR spring. If it is much higher, back the modulator adjustment out until there is no more "drop" on the guage. Now, start to screw IN on the modulator adjuster until you see. the pressure guage start to lift and STOP right there., A cold engine is a lot more comfortable to work on. Major camshaft manufacturers recommend setting valves cold, to avoid erroneous adjustments on lifters that may be "pumped up" If you are setting valves on a fresh engine that has not been run, everything should be well lubricated before you begin. 2. Remove both valve covers and remove the ..., SOURCE: adjust valves on 1971 chevy 350. either the intake is sucking oil from the bottom of the manifold, very common, other is the rings are gone, also very common,lighterr oil usage is a valve stem seal issue. the valves are hydraulic and unless u are installing new rocker arms require no adjustment. Posted on Feb 17, 2009, Conversely, spin the engine over until the intake valve opens and then starts to close, and the exhaust valve is sure to be closed at that point. Smith explains that since you always want to adjust a valve that is fully closed with the lifter on the base circle of the camshaft, an easy way to remember that is “EOIC” or exhaust open, intake ..., To adjust the exhaust lash, turn the engine over until the exhaust valve has completed its lift cycle and the intake valve begins to close (IC). Now, the exhaust lifter is on the base circle ..., Chevrolet V-8 engine. Number 1 firing position: Intake numbers 1, 2, 5, & 7 as well as exhaust numbers 1, 3, 4, & 8. Turn adjusting nut until all lash is removed. When all play has been removed, turn adjusting nut one more turn. This will place the lifter plunger in the center of its travel., Valve Lash Adjustment. Turn the valve rocker arm nuts clockwise until all of the valve lash is removed. Turn the crankshaft clockwise until the alignment mark on the crankshaft balancer is aligned with the notch in the engine front cover tab. Look at the number 1 cylinder valves as the crankshaft balancer alignment mark approaches the …, Adjusting valves on a hydraulic camshaft. Once the valve is in position following the above procedure turn the adjusting nut until there is zero lash between the push rod and the rocker arm, turn the adjusting nut ½ to ¾ of a turn. You have now put adequate preload into the hydraulic lifter. Adjusting valves on a solid/mechanical camshaft. , The Chevrolet 5.7-liter (350-cubic-inch) engine employs an overhead valve design that requires occasional maintenance. Adjusting the clearance between the valve stem and rocker arm, a process known as setting valve lash, can be complicated. The rocker arms and valve train are located on top of the cylinder heads and ...