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Additional parts that may be needed:
Flywheel / Flexplate:
Like all small block V-8 engines produced since 1986, the HT383 engine has a 3.00" diameter flywheel flange
bolt pattern. Small block V-8 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.
This HT383 engine includes a 12 ¾" diameter flexplate, part number 14088765. Use flywheel, part
number 14088650, with manual transmissions. Also, if using a manual transmission, six bolts, part
number 12337973, will be required.
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, part
number 14061685, is recommended for this engine. This heavy-duty bearing adds an extra margin of reliability
to a high performance drivetrain.
Starter:
This HT383 engine does not include a starter. The starter must be matched to the flywheel or flexplate diameter
when installing the HT383 engine. Small diameter flywheels are 12-3/4" in diameter and have a starter ring
gear with 153 teeth. Large diameter flywheels are 14" in diameter and have 168 teeth on the starter ring
gear. This difference in flywheel diameters requires two different starter housing. Starter noses used with
14" diameter flywheel have two offset bolt holes; starters used with 12-3/4" diameter flywheels have bolt holes
that are straight across from each other.
Note: Chevrolet starter motors use special shouldered mounting bolts which register the starter on the block.
The following starters and hardware can be used with the HT383 engine:
10496870
1876552
14097278
14097279
19302919
14037733
Carburetor/Air cleaner:
A 750 or 770 cfm four-barrel carburetor with mechanical or vacuum operated secondaries and an electric choke
is recommended for the HT383 engine. A foam or paper element, low restriction air cleaner should be used to
protect the engine from excessive wear and diffuse the air entering the carburetor. The fuel mixture distribution
can be upset if no diffuser is used causing poor power and misfiring at high engine speeds. Always check for
adequate hood clearance when installing a new air cleaner. Chevrolet Performance Parts has two chromed,
14-inch diameter, open element air cleaner assemblies for single four-barrel carburetors. Part
number 141-306 available from our licensed partner
number 141-302 available from our licensed partner
of these assemblies are supplied with a 3-inch tall filter element, part number 6421746 (AC# A212cw). A taller
4-inch element is available, part number 8997189 (AC# A698c).
HT383 Crate Engine 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 GM SPECIFICATIONS.
Heavy-duty, remanufactured starter for 12-3/4" diameter flywheel/flexplate
Heavy-duty starter for 14" diameter flywheel/flexplate
Bolt, starter mounting, long, for heavy-duty starter, 3/8"-16 x 4.65" long
Bolt, starter mounting, long, for heavy-duty starter, 3/8"-16 x 1.85" long
Permanent magnet gear reduction (PMGR) starter for 14" diameter flywheel/flexplate
(10 lb.)
Bolt, starter mounting, inner for 12-3/4" PMGR starter
REV 04OC17
factoryperformanceparts.com
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PART NO.
DATE
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INITIAL RELEASE - JIM COVEY
04OC17
REVISION - JIM COVEY
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