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Flywheel / Flexplate:
Like all small block V8 engines produced since 1986, the CT400 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 CT400 engine must have a counterweighted flywheel or flexplate for proper
balance. Flywheels and flexplates are available from the chart below.
CT400 Engine - Manual Transmission Flywheels
Part Number
Diameter
14088648
14088646
14088650
CT400 Engine - Automatic Transmission Flexplates
Part Number
Diameter
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, Chevrolet 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 CT400 engine is Chevrolet part number 10465143. 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 Chevrolet
part number 12338064 (long) and 14037733 (short) when installing this starter on this engine.
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 p.s.i. pressure when the engine is operating at wide open throttle (WOT). A high volume
mechanical fuel pump is available from Chevrolet Performance as Chevrolet part number 12355613. lt should be used
with regulator number 10185094. This heavy-duty pump flows 115 gallons per hour at 9 p.s.i. outlet pressure.
Fuel:
Use 92-93 Octane Unleaded Fuel Only. DO NOT USE LEADED RACING FUEL. Lead based fuels will cause premature
failure of the valves and seats. On track testing during the development of this package proved that poor engine
performance would result if leaded racing fuels were used due to the slow burn rate.
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.
Outside
Clutch
Diameter
14"
11.0,11.85"
12 3/4"
10.4"
12-3/4"
10.4"
Outside
Clutch
Diameter
12-8/4"
10.75"
14"
11.50"
14"
10.75,11.50"
Starter Ring
Gear Teeth
Notes
168
For one-piece crank seal
Lightweight nodular iron flywheel, weighs
153
approximately 16 lbs.; for one-piece crank seal
153
Standard weight flywheel; for one-piece crank seal
Starter Ring
Gear Teeth
Notes
153
For one-piece crank seal
Heavy-duty flexplate with increased thickness for
168
one-piece crank seal
168
For one-piece crank seal
88960586
REV 20NO17
PART NO.
DATE
24MR14
Initial Release - Randy Gallagher
20NO17
Revision - Jim Covey
6
SHEET
REVISION
33
OF
AUTH
N/A
N/A
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