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Additional Parts That May Be Needed
Harmonic Damper:
The 350/290 HP engine does not include a harmonic damper. It does include two timing tabs to use either a 6 3/4" or 8" damper.
Part Number for the 6 3/4" damper is 12551537 and for the 8" is 19301706. Use damper retaining bolt P/N 09440024 and
washer P/N 14001829.
Intake Manifold:
The 350/290 HP Base engine does not come with an intake manifold. Recommended intake manifold is 10185063.
Water Pump:
The 350/290 HP Base engine does not come with a water pump. Recommended water pump P/N is 88894341.
Ignition System:
Recommended distributor is the HEI (High Energy Ignition) distributor P/N 93440806. This distributor is a self-contained ignition
system that includes a magnetic pickup, a module, a coil, a rotor, and a cap. The HEI's large diameter cap minimizes arcing
and cross-firing between adjacent spark plug terminals. The cap's male terminals provide a reliable, positive connection for
the spark plug leads. However, the HEI's large diameter cap may interfere with other underhood components in vehicles not
originally equipped with HEI ignition systems. Check for adequate clearance before installation.
The HEI system requires a 12 volt power supply for proper operation. The HEI ignition system should be connected directly to
the battery with 10 or 12 gauge wire through a high quality ignition switch. If you are installing an HEI ignition in an early-model
vehicle originally equipped with a point-type ignition, be sure to remove or bypass the resistor in the wiring harness to ensure
the HEI receives 12 volts continuously. Use distributor connector package P/N 12167658, which includes connectors and wires
for the HEI's tachometer and 12 volt terminals.
Set spark timing at 32º before top dead center (BTDC) at 3000 RPM with the vacuum advance line to the distributor disconnected
and plugged. This setting will produce 32º of total advance at wide open throttle (WOT). The HEI vacuum advance canister
should remain disconnected. This engine is designed to operate using only the internal centrifugal advance to achieve the correct
timing curve.
Flywheel / Flexplate:
Like all small block V-8 engines produced before 1986, the 350/290 HP engine has a 3.58" diameter flywheel flange bolt pattern
and uses a 2 piece rear main oil seal design. Small block V-8 engines produced from 1958 through 1985 had a 3.58" diameter
flywheel flange bolt pattern. The 350/290 HP engine must use a zero balance flywheel/flexplate (no additional weight) for
proper balance. The 350/290 HP engine does not include a flywheel or flexplate. Flywheels and flexplates are available from
the chart below.
350/290 HP Engine - Automatic Transmission Flexplates:
Part Number
00471529
00471598
350/290 HP Engine - Manual Transmission Flywheels:
Part Number
14085720
03991469
350/290 HP Engine Long Block 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.
Converter Bolt
Outside Diameter
12 3/4"
14"
Outside Diameter
Clutch Diameter
12 3/4"
14"
Starter Ring
Pattern
Gear Teeth
9.75",10.75
153
9.75",10.75
168
Starter Ring
Gear Teeth
10.4
153
10.4, 11.00"
168
19172591
REV 21AP17
PART NO.
DATE
Previous Revisions are Archived
21AP17
Revisions - Rusty Sampsel
Notes
For two-piece crank seal
For two-piece crank seal
Notes
For two-piece crank seal
For two-piece crank seal
5
SHEET
REVISION
21
OF
AUTH
N/A
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