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PERFORMANCE
GM
PARTS
Rocker Covers:
The CT350 circle track engine comes equipped with center hold-down bolt rocker covers designed for circle track racing.
The left hand rocker cover, GM Part Number 25534358 is manufactured with two 1-3/8" tall tubes. Mounted on top of these
tubes are breathers, GM Part Number 25534355, for the engine's PCV system. The cover on the right hand side, GM Part
Number 25534357, is stamped without any holes. Included on the right hand valve cover is an engine tune-up decal, GM
Part Number 88960587.
Rocker Arm Nuts / Valve Lash:
Installed on the CT350 circle track crate are unique rocker arm nuts. These new rocker arm nuts, GM Part Number 25534352,
are designed to increase the amount of oil retained on the stamped steel rocker arms. The increase in oil retention increases
the durability and longevity of the rocker arms in circle track racing applications. The nuts include a positive locking screw
to prevent the rocker arm nut from loosening during use. The recommended valve lash for this engine is zero lash plus 1/
4 to 1/2 turn. After the lash has been set, rotate the rocker arm nut 1/3 to 1/2 turn counterclockwise and then snug the set
screw. Tighten the nut and snugged set screw clockwise 1/3 to 1/2 turn to the original lash point.
Bolt Sealing Kit:
A key part of the GM Performance Parts Circle Track crate engine program is the sealing of the engines at the assembly
plant. When the engines are assembled, eight (8) tamper-proof bolts are installed on to ensure the engines have not been
modified after initial assembly. Two bolts are used on the oil pan, two on the front cover, two on the intake manifold, and
one on each cylinder head. These bolts cannot be purchased through your local GM dealer. You must contact your local
track in the event that you decide to rebuild your engine in the future.
Ignition System:
The HEI distributor, GM Part Number 93440806, included with the CT350 circle track engine is a self-contained ignition
system that includes a magnetic pickup, a module, a coil, a rotor, and a cap. The HEI's large diameter cap minimizes arcing
and cross-firing between adjacent spark plug terminals. The cap's male terminals provide a reliable, positive connection
for the spark plug leads. The HEI distributor supplied with the CT350 circle track engine has a hardened (melonized) drive
gear that is compatible with a steel camshaft. Use of a non-hardened distributor gear will result in excessive wear.
The HEI system requires a 12 volt power supply for proper operation. The HEI ignition system should be connected directly
to the battery with 10 or 12 gauge wire through a high quality ignition switch. If you are installing an HEI ignition in an early-
model vehicle originally equipped with a point-type ignition, be sure to remove or bypass the resistor in the wiring harness
to ensure the HEI receives 12 volts continuously. Use distributor connector package GM Part Number 12167658, which
includes connectors and wires for the HEI's tachometer and 12 volt terminals.
Set spark timing at 32º before top dead center (BTDC) at 4000 rpm with the vacuum advance line to the distributor
disconnected and plugged. This setting will produce 32º of total advance at wide-open throttle (WOT). The HEI vacuum
advance canister should remain disconnected for race applications. This engine is designed to operate using only the
internal centrifugal advance to achieve the correct timing curve.
Oil Pan:
Included with the CT350 circle track engine is oil pan, GM Part Number 25534353. This oil pan has eight (8) quart capacity,
and was designed for circle track racing, incorporating baffles and a single kick out on the right hand side of the pan.
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
6200 Grand Pointe Drive, Grand Blanc, MI 48439
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