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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 P/N 10125896 is recommended for this engine. This heavy-duty bearing
adds an extra margin of reliability to a high performance drivetrain.
Starter:
The 350/290 HP does not include a starter. The starter must be matched to flywheel (or flexplate) diameter when installing
a 350/290 HP 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.
The following starters and hardware can be used with the 350/290 HP engine:
10496870
Starter, heavy-duty, remanufactured for 12 3/4" diameter flywheel/flexplate
1876552
Starter, heavy-duty for 14" diameter flywheel/flexplate
14097278
Bolt, starter mounting, long, for heavy-duty starter
14097279
Bolt, starter mounting, short, for heavy-duty starter
10455709
Starter, remanufactured permanent magnet gear reduction (PMGR) for 12 3/4" diameter flywheel/flexplate (10 lb)
19302919
Starter, permanent magnet gear reduction (PMGR) for 14" diameter flywheel/flexplate (10 lb)
14037733
Bolt, starter mounting, inner for 12 3/4" PMGR starter
12338064
Bolt, starter mounting, outer for 12 3/4" PMGR starter; also for 14" PMGR starter (2 required)
Carburetor / Air Cleaner:
A 670 cfm Holley four-barrel carburetor with either mechanical or vacuum operated secondaries and electric choke is recommended
for the 350/290 HP engine. Chevrolet Performance has a 670 cfm Holley four-barrel carburetor P/N 19170092 with vacuum
secondaries available.
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 has
two chrome 14" air cleaner assemblies for single 4 barrel engines. 12342071 is the classic design and 12342080 is the high
performance design.
Fuel Pump:
The 350/290 HP engine does not include a fuel pump. However, it does have a mechanical fuel pump boss and is fully machined
to accept a mechanical fuel pump. The fuel system must be capable of supplying adequate fuel volume at a minimum of 6 psi
pressure when the engine is operating at wide open throttle (WOT). Mechanical fuel pump P/N 06415325 can be used with
P/N 03704817 fuel pump pushrod. Other fuel pump options are available at our website www.chevroletperformance.com.
Headers:
A 350/290 HP engine can be equipped with a header exhaust system for maximum performance in applications where
a nonproduction exhaust system is legal. For street performance and limited competition applications, the recommended header
configuration is 1 3/4" diameter primary pipes, 32 to 36 inches long, with 3" diameter collectors. Use 2 1/2" diameter tailpipes
with a balance tube ("H" pipe) and low restriction mufflers.
Accessory Drive Brackets:
Chevrolet Performance does not offer a front accessory drive kit that is compatible with this engine. The current small block
accessory drive kits offered by Chevrolet Performance will not properly mount on this engine due to missing casting bosses
on the cylinder heads.
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.
19172591
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