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Headers:
A CT400 engine can be equipped with a header exhaust system for maximum performance. The recommended header
configuration is 1 5/8" diameter primary pipes, stepped to 1 %" 10 inches from the exhaust port, 32 to 36 inches long
primaries, with 3" diameter collectors. Some headers and exhaust manifolds do not properly match the Chevrolet
Performance Fast Burn cylinder head exhaust ports. Mismatch in this area will cause excessive heat build-up in the
cylinder head. Be sure you specify "Fast Burn" head when choosing the header for your vehicle.
Spark Plugs / Spark Plug Wires:
ACDelco spark plugs, MR43LTS, are recommended for this engine package. The recommended gap is .045".
The recommended high performance 8 mm diameter spark plug wire set Chevrolet Bowtie Logo wires part numbers are
12361051 (90° spark plug boots) and GM Racing wires 24502521 (135° spark plug boots).
Crate Engine Valve Lash Procedure:
It is imperative to set lash properly on circle track crate engines. Recommended lash is 1/2 to 3/4 when engine is at
normal operating temperature. To properly set the valve lash, warm up the engine to normal operating temperature (1
80°-1 90°) and follow the procedure below. Remove valve covers and disconnect power to the distributor.
IMPORTANT
Set the valve lash as follows:
1. Loosen the rocker arm adjusting nut until the pushrod rotates easily.
2. Loosen/back off the set screw inside the rocker arm nut ½ turn (counter-clockwise).
3. Then, set the valve lash by tightening the rocker arm adjusting nut while rotating the push rod between your fingers
until you feel it stop rotating. When it stops rotating easily, you are at "zero" lash. NOTE: It is critical to ensure that
the tip of the pushrod is seated in the pushrod cup in the rocker arm and the valve stem tip is located in-between
the self-aligning roller tip of the rocker.
4. Next, turn the rocker arm adjusting screw ½ turn clockwise.
5. Then, tighten the set screw inside the rocker arm nut against the rocker arm mounting stud.
6. Next, rotate the rocker arm adjusting nut and the set screw (clockwise) at the same time ¼ turn maximum. This will
allow the set screw to lock properly and hold the valve lash at ½ to ¾ turn (total).
7. Use the sequence below to adjust each rocker arm. NOTE: It is critical that the lifter is on the base circle of the
camshaft to ensure that the lash is set properly.
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.
TITLE
CT400 Circle Track Racing Engine Specifications
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 GM SPECIFICATIONS.
88960586
REV 20NO17
PART NO.
DATE
24MR14
Initial Release - Randy Gallagher
20NO17
Revision - Jim Covey
7
SHEET
REVISION
33
OF
AUTH
N/A
N/A
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