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Crate Engine Valve Lash Procedure:
It is imperative to set lash properly on the Circle Track Crate Engine packages 88958602, 88958603, and 88958604. Recommended lash is Zero
to 1/4 when engine is at normal operating temperature. To properly set the valve lash, warm up the engine to normal operating temperature (180°-
190°) and follow the procedure below. Remove valve covers and disconnect power to the distributor.
IMPORTANT
When lashing valves, it is best to loosen the rocker arm nut slightly while rotating the pushrod with your other hand between two fingers. When you
feel the pushrod stop rotating easily, you are then at zero lash. Tighten the set screw against the rocker arm stud and rotate the rocker arm nut
and set screw at the same time 1/4 turn maximum. This will allow the set screw to lock properly and hold the valve lash.
Valve Lash Adjustment
1. Position engine at top dead center (TDC) on #1 cylinder in firing position.
Adjust intake valves on #2 and #7 cylinders.
Adjust exhaust valves on #4 and # 8 cylinders.
2. Rotate crankshaft 1/2 revolution clockwise.
Adjust intake valves on #1 and #8 cylinders.
Adjust exhaust valves on #3 and #6 cylinders.
3. Rotate crankshaft 1/2 revolution clockwise to #6 cylinder in firing position.
Adjust intake valves on #3 and # 4 cylinders
Adjust exhaust valves on #5 and #7 cylinders.
4. Rotate crankshaft 1/2 revolution clockwise.
Adjust intake valves on #5 and #6 cylinders
Adjust exhaust valves on #1 and #2 cylinders
Reinstall valve covers and connect power to the distributor. Start engine to check for loose valve lash.
CT350 Circle Track Engine - 88958602 - Specifications
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.
88960547
REV 05FE08
PART NO.
DATE
REVISION
GENERAL MOTORS
SERVICE PARTS OPERATIONS
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