Chevy 350 Cold Valve Lash Adjustment Diagram
Chevy 350 cold valve-adjustment order for hydraulic and solid lifters, with zero-lash, preload, firing-order and cam-card guidance.
On a cold Chevy 350, first identify the lifters. For a hydraulic valvetrain, bring each cylinder to compression TDC in the 1-8-4-3-6-5-7-2 firing order, find true zero lash with light finger pressure, then apply the exact lifter/engine preload. Chevrolet's 350/290 example uses 1/8 turn past zero lash; Ram Jet 350 uses 3/4 turn. Solid lifters require the cam card's specified cold setting or its approved hot-to-cold correction—never a hydraulic zero-lash method.
A valve-adjustment diagram is useful only after the valvetrain is identified. Engines grouped under the Chevy 350 Gen I name can use hydraulic lifters, mechanical lash, pedestal rockers, screw adjusters or selective buckets. Those systems do not share one clearance or one adjustment technique.
Chevrolet's own crate guides demonstrate why the phrase 'three-quarter turn for every 350' is unsafe: its 350/290 and Ram Jet 350 publish different settings. The installed cam and lifter package decides the branch.
Use the interactive sequence as a position-and-recording aid. It does not replace the exact service manual, cam card or cylinder-head instructions. Record every starting measurement, keep reused parts in their original positions and turn the crankshaft by hand before starting the engine.
Interactive Chevy 350 cold adjustment order
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Adjust both valves only at that cylinder's compression TDC; advance through the firing order.
Chevy 350 Valve Lash Adjustment Cold Diagram
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Firing order | 1-8-4-3-6-5-7-2 | Move 90 crank degrees per cylinder |
| 350/290 example | 1/8 turn past zero lash | Named hydraulic flat-tappet crate engine |
| Ram Jet 350 example | 3/4 turn past zero lash | Named hydraulic roller crate engine |
| COMP target | 0.030 ± 0.010 in | Applicable hydraulic lifter preload |
The diagram is an eight-cylinder positioning sequence, not one universal preload value. Rocker-stud pitch, lifter travel, pushrod length and cam design determine the final setting.
How to use this specification correctly
- 01
Confirm the engine code, model year, cylinder-head casting and whether the valvetrain is original. Obtain the exact vehicle service procedure or the cam, lifter and rocker instructions for modified hardware.
- 02
Let the engine reach the specified hot or cold condition. Disconnect the battery when removing powered components, protect open oil drains and label coils, hoses, brackets and cover fasteners.
- 03
Remove the cover without dropping debris into the head. Inspect oil supply, springs, retainers, rocker tips, cam lobes and pushrods before changing an adjuster; mechanical damage cannot be repaired by hiding it with a tighter setting.
- 04
Rotate the crankshaft only in its normal direction with the specified socket. Put the valve being measured on the cam lobe's base circle or place the named cylinder at compression TDC according to the selected source.
- 05
Measure with clean gauges held square to the specified contact surfaces. A gauge should have an even light drag; forcing it through or measuring at an angle gives a false result.
- 06
At compression TDC, gently spin or move the pushrod while removing free play. Stop at the first true zero-lash point without depressing the hydraulic plunger.
- 07
Apply the documented fraction of a turn or measured preload, then rotate the crank 90 degrees to the next cylinder in 1-8-4-3-6-5-7-2 order.
- 08
Rotate the crankshaft through two complete revolutions by hand. Recheck timing marks, all adjusted positions and free movement before reinstalling covers with serviceable seals.
- 09
After startup, confirm oil pressure and listen for abnormal ticking. A persistent noise, misfire or low compression requires diagnosis of oiling, cam wear, lifter condition, valve seating and geometry rather than another blind adjustment.
Application and valvetrain boundaries
Chevrolet's own crate guides demonstrate why the phrase 'three-quarter turn for every 350' is unsafe: its 350/290 and Ram Jet 350 publish different settings. The installed cam and lifter package decides the branch.
A cold-engine workflow is convenient for assembly. A solid-lifter hot lash must be converted only with a correction supplied by the cam or cylinder-head manufacturer, then verified hot.
How to use the interactive diagram
Select each point in order and mark that position on a worksheet only after the cam is on its base circle. The point labels describe the documented workflow; they are not a universal permission to tighten every rocker at once.
When a procedure uses two crank positions, finish the listed valves at the first position, rotate exactly as directed and complete the remaining group. When it follows firing order, move one cylinder at a time and verify compression TDC.
Measurement and adjustment notes
At compression TDC, gently spin or move the pushrod while removing free play. Stop at the first true zero-lash point without depressing the hydraulic plunger.
Apply the documented fraction of a turn or measured preload, then rotate the crank 90 degrees to the next cylinder in 1-8-4-3-6-5-7-2 order.
Mistakes that damage valves or camshafts
- Assuming every hydraulic 350 uses the same turn count
- Depressing the plunger while searching for zero lash
- Applying hydraulic preload to a solid lifter
- Adjusting a valve while its cam lobe is rising
- Using an unknown balancer mark without confirming compression TDC
Before the covers go back on
- Every measurement recorded by cylinder and intake/exhaust position
- Locknuts or pedestal bolts tightened with the specified tool and torque
- Pushrods seated in lifter cups and rocker seats
- Oil passages, seals and cover rails clean
- Crankshaft turned by hand with no binding
- Engine-specific firing order and timing marks rechecked
Chevrolet Chevy 350 Gen I specifications can change by model year, engine, platform, wheel, and installed component. Confirm the VIN or engine identity, part numbers, fastener condition, and the current manufacturer instructions before service.
Chevy 350 Cold Valve Lash Adjustment Diagram FAQs
What is the cold Chevy 350 valve-adjustment order?+
Use 1-8-4-3-6-5-7-2, moving each cylinder to compression TDC before adjusting both valves.
How many turns past zero lash?+
It depends on the exact valvetrain. The cited Chevrolet examples use 1/8 turn and 3/4 turn, so identify the parts rather than choosing a folklore value.
Should valve clearance be checked hot or cold?+
Use the condition stated by the exact procedure. Temperature changes the dimensions of the head, valves and valvetrain, so a hot specification cannot silently be used cold.
Can a noisy valve be fixed by tightening it more?+
Not safely. Noise may come from low oil pressure, a collapsed hydraulic adjuster, worn cam, bent pushrod, damaged rocker, excessive clearance or an exhaust leak. Diagnose the cause first.
Why must the cam lobe be on its base circle?+
The base circle is the non-lifting portion of the cam. Measuring or setting preload while the lobe is opening a valve creates a false setting and can hold the valve off its seat.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
1Chevrolet Performance 350/290 long-block guideChevrolet's named hydraulic-flat-tappet crate engine uses 1/8 turn past zero lash.↗2Chevrolet Performance Ram Jet 350 guideChevrolet's Ram Jet hydraulic-roller example uses 3/4 turn past zero lash.↗3COMP Cams valve-adjustment instructionsThe valvetrain manufacturer defines zero lash and gives a 0.030 ± 0.010 inch hydraulic-plunger preload target for applicable lifters.↗