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PERFORMANCE
GM
PARTS
Flywheel / Flexplate:
Like all small block V8 engines produced since 1986, the CT350 circle track engine has a 3.00" diameter flywheel
flange bolt pattern. Small block V8 engines produced from 1958 through 1985 had a 3.58" diameter flywheel flange
bolt pattern. This change in bolt circle diameter was made to accommodate a leak-resistant one-piece rear main
seal. Due to revisions in the crankshaft design, a CT350 circle track engine must have a counterweighted flywheel
(or flexplate) for proper balance. The CT350 circle track engine includes a flexplate, GM Part Number 14088765.
Additional flywheels and flexplates are available from the chart below.
CT350 Circle Track Engine - Manual Transmission Flywheels
GM Part
Number
10105832
14088646
14088650
CT350 Circle Track Engine - Automatic Transmission Flexplates
GM Part
Number
14088765
12554824
14088761
Pilot Bearing:
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission.
The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot
bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing, GM Part Number 14061685, is
recommended for this engine. This heavy-duty bearing adds an extra margin of reliability to a high performance
drivetrain.
Starter:
The recommended starter for the CT350 circle track engine is GM Part Number 10455702. This is a lightweight gear
reduction starter that was originally used on the 1988-1991 Corvette. This starter is for use with 12-3/4" flywheels.
Use GM bolt Part Number 14097278 (long) and 14097279 (short) when installing this starter on this engine.
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.
Outside
Clutch
Diameter
Diameter
14"
11.0,11.58"
12-3/4"
10.4,11.0"
12-3/4"
10.4"
Outside
Convertor Bolt
Diameter
Diameter
12-3/4"
10.75"
14"
11.50"
14"
10.75,11.50"
Starter Ring
Gear Teeth
Notes
168
For one-piece crank seal
153
Lightweight nodular iron flywheel, weighs
approximately 15 lbs.;for one-piece crank seal
153
Standard weight flywheel; for one-piece crank
seal
Starter Ring
Gear Teeth
153
168
168
REV 05FE08
PART NO.
DATE
REVISION
GENERAL MOTORS
SERVICE PARTS OPERATIONS
6200 Grand Pointe Drive, Grand Blanc, MI 48439
Notes
For one-piece crank seal
Heavy-duty flexplate with
increased thickness for
one-piece crank seal
For one-piece crank seal
88960547
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