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PERFORMANCE
GM
PARTS
Additional parts that may be needed:
Flywheel / Flexplate:
Like all small block V-8 engines produced since 1986, the 350HO Deluxe 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. Due to revisions in the crankshaft design, a 350HO Deluxe engine must have a counter-
weighted flywheel (or flexplate) for proper balance. The 350HO Deluxe engine includes a flexplate part number
14088765. Additional flywheels and flexplates are available from the chart below.
350HO Deluxe Engine - Manual Transmission Flywheels
Part
Outside
Number
Diameter Diameter
14088648
14"
14088646
12 3/4"
14088650
12 3/4"
350HO Deluxe Engine - Automatic Transmission Flexplates
Part
Outside Torq Conv. Starter Ring
Number
Diameter
14088765
12 3/4"
12554824
14"
14088761
14"
Pilot Bearing:
You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmis-
sion. 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:
The 350HO Deluxe does not include a starter. The starter must be matched to flywheel (or flexplate) diameter
when installing a 350HO Deluxe engine. Small diameter flywheels are 12 3/4" in diameter, and have starter ring
gears 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 housings. Starter noses used with 14"
diameter flywheels 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.
350HO Deluxe 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 GMSPO SPECIFICATIONS.
Clutch
Starter Ring
Gear Teeth
11.0,11.58"
168
10.4,11.0"
153
10.4"
153
Patt.
Gear Teeth
10.75"
153
11.50"
168
10.75,11.50"
168
REV16JL08
Notes
For one-piece crank seal
Lightweight nodular iron flywheel, weighs approximately
15 lbs.; for one-piece crank seal
Standard weight flywheel; for one-piece crank seal
Notes
For one-piece crank seal
Heavy-duty flexplate with increased thickness for one-piece
crank seal
For one-piece crank seal
12487544
PART NO.
DATE
REVISION
GENERAL MOTORS
SERVICE PARTS OPERATIONS
6200 Grand Pointe Drive, Grand Blanc, MI 48439
8
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