Adjusting valves on a chevy 350

Use an assembly lube or lubriplate 105. The rocker arms (all of them) should already be torqued to the proper setting. While at TDC on #1 cil, use this order-. Intake, 1, 2, 3. Exhaust, 1, 5, 6. Spin the push rod back & forth with your finger till it stops spinning or, you see the lifter plunger just start to depress.

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.Remove the engine cover from the passenger compartment for access. Remove the rocker arm covers. For details, please refer to Section 3 of this manual. To prepare the engine for valve adjustment, rotate the crankshaft until the mark on the damper pulley aligns with the 0° mark on the timing plate and the No. 1 cylinder is on the compression ...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 ...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, & ...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.

Check out this post on How to Adjust Valves on A 350 Chevy to know more about the location of the valves. 2. Chevy 350 Water Temp Sensor Location. The water temperature sensor is located close to the cylinder head water outlet. It keeps a constant check on the temperature of the engine coolant. 3. Chevy 350 Oil Temp Sensor Location. The Chevy ...Jun 11, 2016 · How to adjust Hydraulic valves first time every time! May 21, 2022 · In this video, Ryan shows you how to install push rods and rocker arms and how to set valve lash on a Chevy 350. He rebuilt this small block Chevy 350 which ... Recorded on April 7, 2011 using a Flip Video camcorder.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.Rotate the engine to TDC for #1. Adjust valves. Repeat for #6 TDC. For pushrod/valve adjustment, I use the no movement up and down because spinning the rod is a feel. The process off up and and down (lash) is completed by tightening the rocker arm nut—which eliminates up and down movement.Setting the valves on a small block chevy with hydraulic lifters. Other makes may be similar, just follow the correct firing order.Once the plunger reaches the retainer, it can no longer. provide effective valve train adjustment, and the valvetrain will start. making noise. The distance the plunger is compressed into the. lifter body when the lifter is at the low point in its bore is referred to. as "lifter preload.". This is the "valve lash" or.

Use an assembly lube or lubriplate 105. The rocker arms (all of them) should already be torqued to the proper setting. While at TDC on #1 cil, use this order-. Intake, 1, 2, 3. Exhaust, 1, 5, 6. Spin the push rod back & forth with your finger till it stops spinning or, you see the lifter plunger just start to depress.Here’s a quick video on how to properly adjust your valve lash and tightening rocker studs. this was done on a 1975 small block Chevy with hydraulic lifters.on the chevy 350 if the valves are to tight after adjusting it will not run because the valves are not closing. hopefully you did not tighten the rockers all the way down .if you did you may have bent valves or pushrods. the proper procedure before start up is to adjust rockers with each cyl on compresion stroke.Turn crankshaft one complete revolution, which will bring engine in position to fire cylinders 4 (V6) or 6 (Inline 6 and V8). With engine in this position, adjust the following valves: V6-229 and 262, Exhaust Nos. 2, 3 and 4; Intake Nos. 4, 5 and 6. 6-250 and 292, Exhaust Nos. 2, 4 and 6; Intake Nos. 3, 5 and 6.

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This is an in depth guide and explanation on adjusting the valve lash on a small block Chevy using the EOIC method.#chevrolet #backtobasics #howtoThe Chevy 350 AC Bracket Diagram provides a visual representation of how the different components fit together in the SBC engine. It helps in understanding the proper placement of the brackets, the routing of the AC belt, and the overall configuration of the system. Referencing the diagram is crucial during the installation, troubleshooting, or ...Since you have already adjusted the valves, remove the valve cover from the side that was loose, and measure the travel of that rocker and the other rockers. They should all have the same amount of upward travel. If not, then the cam is worn and needs to be replaced. That is, provided the stud is not bad.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.Start with # 1 and go through the firing order and do all of the intakes, then go back to #1 and do all the exhausts in order. Two turns and you are done. If you want to check to see if your method was ok, turn the engine until the #1 exhaust lifter starts to move and then see how much preload you have on the intake valve.

Use an assembly lube or lubriplate 105. The rocker arms (all of them) should already be torqued to the proper setting. While at TDC on #1 cil, use this order-. Intake, 1, 2, 3. Exhaust, 1, 5, 6. Spin the push rod back & forth with your finger till it stops spinning or, you see the lifter plunger just start to depress.Checking and adjusting the valves on a Chevy 350 engine is an important part of regular maintenance to ensure proper engine performance and longevity. Here’s a step-by-step guide on how to do it: Tools and Materials You’ll Need: Ratchet and socket set. Feeler gauges. Valve cover gaskets (if needed) Torque wrench. A small hand mirror (optional)How to Fix Chevy 350 Engine Bracket Issues. Follow these steps to fix Chevy 350 Engine Bracket Issues: 1. Identify the Issue: Listen: Often, a rattling or squealing noise can indicate a bracket that's either loose or misaligned. Visual Inspection: Look for any cracks, bends, or wear in the brackets and mounting points. 2.4102 posts · Joined 2011. #1 · Dec 1, 2015. Here's a pic of a static valve adjustment sequence I constructed for a buddy. Good for firing order 1-8-4-3-6-5-7-2 (chevy of course) However, I oriented the numerals on the pictorial banks to help indicate the relative position of each valve on a BBC. Print it out and use it if ya like it.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.Check Details Valve chevy block adjustment small. Lash valve engine adjust lifters set solid setting adjustment chevy 350 lifter pro enginelabs performance adjusting throwback thursday tappet flatHow to adjust valves on a big block chevy Ford 302 ho and 351w valve adjusting orderEverything you wanted to know about the big-block chevy engine.Sbc 350 adjusting valves/rocker arms. 2000 TAHOE ONE MEMBER; 1978 CHEVROLET MALIBU; ... The other way takes a lot more time and you'll need a chart that shows which valves to adjust when. You start by turning the engine until piston number 1 is at top dead center on the compression stroke, then the chart will tell which exhaust and which intake ...Rotate the engine by hand with the valve covers off. Watch the valves move up and down. Start out with number 1 cylinder and when the exhaust valve is at its fullest stroke adjust the intake valve and remember to only snug it and don't over tighten it. Then do the same with the intake valve. Do this on each cylinder.Adjusting Chevy SB 350 Valves #132037 Sun May 02 2004 01:26 PM. Joined: Oct 2003. Posts: 36. Copperas Cove, TX. M. Meredith55 OP. Junior Member. After learning about this process, I decided to post this for others who may follow: I asked how to adjust the valves on a 350 with hydraulic lifters. I got varied answers.Save yourself some money checking your valve clearance yourself. This video is designed with the rookie wrencher in mind.In this video I only check the valve...

Jun 25, 2020 · This is zero lash. To set preload, merely tighten the adjuster nut another half-turn after zero lash. If you are setting the lash on a mechanical lifter camshaft, use the appropriate feeler gauge between the valve tip and the rocker arm and adjust the lash until there is a reasonable tug or pull on the feeler gauge.

Posted on Jul 25, 2009. Crank the engine until the mark on the damper aligns with the TDC mark on the timing tab and the engine is in #1 firing position. To adjust a valve back off the adjusting nut until lash is felt at the pushrod. Tighten the nut until all lash is removed. This can be determined by rotating the pushrods with your fngers.3. Use a feeler gauge, set to the correct valve lash, and place it between the tip of the valve stem and rocker arm. Adjust until you arrive at the proper setting and lock the adjuster in place. 4. After the intake valve has been adjusted, continue to rotate the engine, watching that same intake valve.Firing @ #1, You can now adjust the following valves: INTAKE on cylinders 1,2,5,7. EXHAUST on cylinders 1,3,4,8. Loosen the adjusting nut until lash is felt by rotating the pushrod. Then. tighten the adjusting nut while rotating the pushrod until all lash is. removed. Now tighten the adjusting nut 1/2 full turn.Me,I like to adjust hydraulic lifters "cold" with the engine off,via the Motors or Chilton's manual method-..they tell you to turn the engine over to #1 TDC compression stroke and adjust the following valves : Exhaust valves on cylinders # 1,3,4,8 Intake valves on cylinders #1,2,5,7 Turn engine to the #6 TDC compression stroke and adjust:How do you adjust Chevrolet valves? Depending on what motor it is, the most common being the 350, you should want to to start by putting the motor on top dead center, compression stroke. then ...Jun 11, 2016 · How to adjust Hydraulic valves first time every time! 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.This is the valve adjustment method most of the racers I worked with used - first write the first half of the firing order over the second half. This example is for chev and chrys V8s. 1843 6572 Rotate engine - watch #6 rockers - when exhaust is closing and intake just starts to open (overlap) adjust both valves on #1.

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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.This will be the zero lash adjustment point. For hydraulic lifters, tighten the rocker arm adjustment nut 1/4 - 1/2 of a turn. For solid lifters, back off the rocker arm adjustment nut until your feeler gauge just fits under the contact point between the valve stem and the rocker arm. Fine tune the adjustment by checking it with a feeler gauge ...Instructions for adjusting the valves with an engine using either a hydraulic or solid camshaft is the same procedure (for example, Chevy 350, and others), as far as when we perform the adjustment.Firing @ #1, You can now adjust the following valves: INTAKE on cylinders 1,2,5,7. EXHAUST on cylinders 1,3,4,8. Loosen the adjusting nut until lash is felt by rotating the pushrod. Then. tighten the adjusting nut while rotating the pushrod until all lash is. removed. Now tighten the adjusting nut 1/2 full turn.Repeat the process for the remaining valves. Valve Lash Adjustment in Chevy 350 Sequence. The Chevy 350 engine is a classic V8 engine commonly found in muscle cars and trucks. Here’s how you can adjust the valve lash in a Chevy 350 engine: Remove the valve covers to access the valve train components.The spring in the seat has free movement. It moves from top and bottom by 2-3mm perpendicular to the shock absorber axis. Nice job - that makes sense. Appreciate the fact that you reported back your finding so that we can all become a little smarter.Step 2: Locate Top Dead Center (TDC) for Cylinder 1. To adjust the valves, you need to locate the TDC for cylinder 1. This position ensures that the valves for that cylinder are in a resting state. Turn the engine manually using a wrench until you align the timing marks for cylinder 1.Shorty after adjusting valve clearance my truck still is making a valve noise. ... 1970 C/50 chevy 350 which rockers do I adjust on #1 my book only goes back to 93 and I wanted to make sure nothing was different. Mine says exhaust 1,3,4,8 then intake 1,2,5 but not all of these appea ...Use a torque wrench to tighten the bolts to the recommended settings. Step 4: Mount the power steering pump. With the bracket securely installed, mount the power steering pump onto the bracket. Line up the pump with the mounting holes on the bracket and use the provided bolts to secure it in place.Valve Adjustment on stock 283. I followed the steps in the manual to tighten the 8 valves with #1 @ tdc, rotate the motor 180 and then tighten the remaining 8. I spun the pushrod till it stopped then added 1 more turn to each nut. The car then ran rough so I backed each nut off 1/4 turn.Jun 15, 2021 ... Pull off the valve cover on one side of the engine. While slow idling, back off the rocker arm adjusting bolt slowly until it starts to click. ….

72K views 5 years ago. Showing how to adjust the valve lash on a chevy 350 with hydraulic flat tappet lifters. ...more.Jun 2, 2020 · A Quick How to for Adjusting your Small block 350 Valves into spec! This information can be used for other Push rod/ Hydraulic tappet lifter setups too! 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.LaterValve adjustment on 1997 350 vortec suburban. I have spent 3 weekends on trying to adjust the valves on my 1997 suburban 350 vortec. I have adjusted them 4 times with going to TDC #1 and adjusting the approprite valves. Then another 360 degrees with #6 at TDC and adjusting those valves. I removed the cap to make sure it is at the appropriate ...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.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!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 ...Tighten the adjusting nut until there’s a slight drag when moving the feeler gauge. Do not over-tighten or you will risk damage to the camshaft in a short period of time. Tighten the adjuster nut until there is a slight drag when moving the “feeler” gauge. Top Engine Builders give us 7 Tips for Setting Valve Lash: Find the sweet spot.From the point when the #1 cylinder is at TDC you can set 1, 2, 5, and 7 intake valves and 1, 3, 4, and 8 exhaust valves. Rotate the engine one revolution and set the rest. Tags Chevy Corvette ... Adjusting valves on a chevy 350, Step 4: Repeat for Each Cylinder. The 350 Chevy engine typically follows a firing order, and adjusting the valves in this order ensures proper timing and balance. The firing order for a typical Chevy V8 engine is 1-8-4-3-6-5-7-2. Adjust the valves in this sequence, moving from one cylinder to the next until all valves have been adjusted., A. Starting with #1 cylinder, turn the engine over until the exhaust pushrod just begins to move up. B. At this point, stop and adjust the intake valve on the same cylinder. 1) Tighten the rocker until you can roll the pushrod between your thumb and forefinger with the slightest bit of resistance. 2) At this point tighten between an additional ..., 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., 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., [ January 25, 2024 ] Reviving Lil’ Joe, A 1976 Chevy C10 With The 350 That Shouldn’t Be Builds and Examples [ January 23, 2024 ] How To Wire Headlights, Turn Signals, Brake Lights, Parking Lights, Hazards, Horn How To & DIY [ January 23, 2024 ] Barn Tour: A Pontiac from EVERY Decade & RARE International Trucks Hot Rod Lifestyle, Comp Cams XE262H-10 - Duration @ 0.05 is 218 In and 224 Ex, Lobe separation is 110, Gross valve lift is 0.462 In adn 0.469 Ex GM distributor with Accel HEI Super Coil Freshly rebuilt Turbo 350 with mild shift kit and stock converter Lower end only had a couple thousand miles on after last rebuild as previous owner didn't find it fast …, [ January 25, 2024 ] Reviving Lil’ Joe, A 1976 Chevy C10 With The 350 That Shouldn’t Be Builds and Examples [ January 23, 2024 ] How To Wire Headlights, Turn Signals, Brake Lights, Parking Lights, Hazards, Horn How To & DIY [ January 23, 2024 ] Barn Tour: A Pontiac from EVERY Decade & RARE International Trucks Hot Rod Lifestyle, I found this advice while doing a search on how to adjust the kickdown cable on a TH-350. My 70 El Camino would rarely (if ever) down shift when mashing the throttle at any speed. ... A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications ..., Robert Dana teaches step by step instructions how to adjust valves with Hydraulic lifters on a small block. Milwaukee Electric Tools MLW48-22-9214 Pry bar Se..., 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 ..., Chevrolet's small-block V-8 engine timing specifications depend on the cubic-inch displacement and whether a manual or automatic transmission matches the engine. Small-blocks have ..., ADJUSTING THE EXHAUST VALVES: Lets go back to #1 cylinder just to make it simple. Start turning clockwise from the last location. Now you are ..., Adjusting Valves Authored by Wes Vann, revised September 11, 1999 ... As the push-rod goes up, the rocker pushes the valve down (open). Small block Chevy rockers have a ratio of 1 to 1.5. This means that the valve moves 1.5 times the distance that the push-rod moves. (high lift rockers are something like 1 to 1.6) The accuracy of the factory ..., Sbc 350 adjusting valves/rocker arms. 2000 TAHOE ONE MEMBER; 1978 CHEVROLET MALIBU; ... The other way takes a lot more time and you'll need a chart that shows which valves to adjust when. You start by turning the engine until piston number 1 is at top dead center on the compression stroke, then the chart will tell which exhaust and which intake ..., 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..., Adjust the intake valves on cylinders 1, 2, 5, & 7 by loosening the rocker nut until play is in the pushrod then just take the up and down play in the pushrod and tighten the rocker nut 90 degrees. 3. Adjust the exhaust valves on 1, 3, 4, & 8 in the same manner. 4. Rotate crank 360 degrees to get cylinder #6 to compression TDC, Cam gear at 6 o ..., Oct 15, 2023 · To adjust lifters on a chevy 350, start by removing the valve cover and rotating the engine until the lifter is on the base circle of the camshaft. Then, use a feeler gauge to measure the gap between the rocker arm and the valve stem. Finally, adjust the lifter by loosening or tightening the adjusting nut until the correct gap is achieved. , If using a. hydraulic camshaft and no specifications are available, turn the rocker arm adjusting nuts 1/2 to 3/4 of a turn. past zero lash. A) Following the proper firing order for your engine, turn the crank. shaft until the first cylinder listed in the firing order is at TDC on. the compression stroke., C1 & C2 Corvettes - Valve lash adjustment for solid lifter motors - I had a hard time finding this valuable document so I thought I would re-post it here for future searchers. It's written by our own John Hinckley and Duke Williams. A MUST-HAVE for anyone adjusting valve lash on a solid lifter motor. I completed the..., Here's a thorough guide to the whole process: Step 01: Find the inlet and outlet valves. Step 02: Now, turn the engine until you fully close the valve. Step 03: Insert a feeler gauge and find the exact amount of gap inside the valve. Keep changing the sizes of the feeler gauge until you get the exact match., This is zero lash. To set preload, merely tighten the adjuster nut another half-turn after zero lash. If you are setting the lash on a mechanical lifter camshaft, use the appropriate feeler gauge between the valve tip and the rocker arm and adjust the lash until there is a reasonable tug or pull on the feeler gauge., Install the pushrods in the original location. Coat the ends of the pushrods with GM P/N (NNN) NNN-NNNNor the equivalent. The intake pushrods are identified with yellow stripes and are 5-3/4 inches long. Exhaust pushrods are identified with green stripes and are 6 inches long. Ensure that the pushrods seat in the lifter., Turn 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., Me,I like to adjust hydraulic lifters "cold" with the engine off,via the Motors or Chilton's manual method-..they tell you to turn the engine over to #1 TDC compression stroke and adjust the following valves : Exhaust valves on cylinders # 1,3,4,8 Intake valves on cylinders #1,2,5,7 Turn engine to the #6 TDC compression stroke and adjust:, valve adjustment for 250 inline 6 cylinder GM 73 chevy c10. Answered in 1 hour by: Chevy Mechanic: AutoDoc. Hello, From GM service manual: HYDRAULIC LIFTER ADJUSTMENT. Rotate engine until ignition rotor is at #1. Adjust INTAKE valves 1, 2, and 4 and EXHAUST valves 1, 3, and 5 by: Backing off rocker arm nut until lash is felt, then tighten nut ..., Systemically reassemble the engine once all valves are adjusted following the correct sequence. If the valve adjustment was done correctly, there should be minimal need for future adjustments, contributing to the longevity of your Chevy 350 engine. Hydraulic Valve Adjustment Made Easy. Here's an easy Hydraulic Valve adjustment method: 1., Use a torque wrench to tighten the bolts to the recommended settings. Step 4: Mount the power steering pump. With the bracket securely installed, mount the power steering pump onto the bracket. Line up the pump with the mounting holes on the bracket and use the provided bolts to secure it in place., Well known since the 70s. spinning the pushrod with fingers is just a way to find the zero lash point. Back off all your polylocks at least two full turns. Back off the setscrew in each one at least two full turns. Turn the engine with balancer bolt or remote starter button till #1 exhaust just starts to open., Turn key off, unplug the IAC. Remove the paper clip, start engine and turn up the base idle at the throttle plates using a T20 screwdriver on the curb idle screw next to the throttle cable, maybe 500-600 rpm. Once its done, turn off ign and plug the IAC back in. You could disconnect the battery to erase what it has learned and the IAC fault ..., 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 ..., 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., Jun 10, 2021 · Most hydraulic lift camshafts will require zero lash for the proper adjustment. The process will be the same whether you have stamped steel rockers or roller tip rockers. To achieve zero lash, tighten down the rocker as you spin the pushrod in your fingers, do this until you notice slight resistance as you spin the pushrod (this is zero lash). , Bottom line: the top of the plunger in a hydraulic lifter (the cup the pushrod rides in) will reach the top of the lifter when all lash is removed even with the engine off. That said, it is just as easy, more safe and much cleaner to adjust the valves with the engine off whether it is a fresh rebuild or a previously run engine. Team Chevelle ...