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Additional parts that may be needed:
Flywheel / Flexplate:
Like all small block V-8 engines produced since 1986, the ZZ4 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 ZZ4 engine must have a counterweighted flywheel (or flexplate) for proper balance. The ZZ4 engine includes a
flexplate Part number 14088765. Additional flywheels and flexplates are available from the chart below.
ZZ4 Engine - Manual Transmission Flywheels
Part #
Outside Dia.
14088648
14"
14088646
12 3/4"
14088650
12 3/4"
ZZ4 Engine - Automatic Transmission Flexplates
Part #
Outside Dia.
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 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:
The ZZ4 does not include a starter. The starter must be matched to flywheel (or flexplate) diameter when installing a
ZZ4 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.
ZZ4 Engine Long Block Specifications
TITLE
Clutch Dia.
Starter Ring Gear Teeth
11.0,11.58"
168
10.4,11.0"
153
10.4"
153
Conv Bolt Pat.
Starter Ring Gear Teeth
10.75"
11.50"
10.75,11.50"
REV 09JA15
Notes
For one-piece crank seal
Lightweight nodular iron flywheel, weighs
approximately 15 lbs.; for one-piece crank
seal
Standard weight flywheel; for onepiece
crank seal
Notes
153
For one-piece crank seal
168
Heavy-duty flexplate with increased
thickness for one-piece crank seal
168
For one-piece crank seal
19172321
PART NO.
7
27
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