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Fuel Pump:
A fuel pump is not included with this engine. However, the fuel system must be capable of supplying adequate fuel
volume at a minimum of 6 psi pressure when the engine is operating at wide open throttle (WOT). A high volume, in-
line electric fuel pump is available from Chevrolet Performance as Chevrolet part number 25115899. This heavy-duty
pump flows 72 gallons per hour at 6-8 psi outlet pressure. A high volume mechanical fuel pump, Chevrolet part number
12355613, is also available. This pump flows 115 gallons per hour at 9 psi outlet pressure. Fuel pressure regulator
10185094 is recommended for use with this pump.
Headers:
A CT355 circle track 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 'AK' 10 inches from the exhaust port,
32 to 36 inches long primaries, with 3" diameter collectors.
Spark Plugs / Spark Plug Wires:
The CT355 circle track engine does not come with spark plugs or spark plug wires. ACDelco spark plugs MR43LTS are
recommended for this application.
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 engine packages 19258602, 88958603, and 19318604.
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.
TITLE
CT355 Circle Track Racing Engine (88958603) Specifications
88960548
IR 24MR14
PART NO.
6
32
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