This engine assembly has been discontinued and replaced with part number 19301295
Part Number: 12498772
Engine Type: Chevy Small-Block V-8
Displacement (cu in): 383
Bore x Stroke (in): 4.000 x 3.800
Block (P/N 88962516): Cast-iron with 4-bolt main caps
Crankshaft (P/N 12489436): 4340 forged steel
Connecting Rods (P/N 12497624): Heavy-duty PM steel
Pistons (P/N 12499103): Hypereutectic aluminum
Camshaft Type (P/N 19210723): Hydraulic roller
Camshaft Lift (in): .509 intake / .528 exhaust
Camshaft Duration (@.050 in): 222° intake / 230° exhaust
Cylinder Heads (P/N 12464298): Fast Burn aluminum;
62cc chambers
Valve Size (in): 2.000 intake / 1.550 exhaust
Compression Ratio: 9.6:1
Rocker Arms (P/N 12367345): Aluminum roller style
Rocker Arm Ratio: 1.5:1
Recommended Fuel: 92 octane
Ignition Timing: Base 10° BTDC, 32° Total
Maximum Recommended rpm: 6,000
Balanced: External
General Motors Warranty Information
Select the parts below to finish your crate engine and get running in less time!
24216083 Hydra-Matic 4L65-E Four-Speed Automatic Transmission (LS-Series V-8)
19212657 Transmission Controller
12480127 Short Aluminum Valve Covers
12496822 Intake Manifold Vortek Design
12497698 Serpentine Accessory Drive system
93440806 HEI Distributor
12361146 High Torque Mini-Starter
INSTALLATION NOTES
• Requires addition of carburetor, ignition, intake manifold, fuel pump, and starter (not included)
• 425-horsepower rating achieved during GM testing with high-rise single-plane intake manifold (P/N 12496822) and a 770-cfm carburetor with vacuum secondaries
• Chevrolet Performance dual-plane intake manifold (P/N 12366573) may be used to avoid hood clearance
problems, but peak power may decrease by approximately 15-20 horsepower
• Comes with 12.750-inch automatic transmission flexplate. Requires 1986-1999 350-style externally balanced flywheel for manual transmission.
• Designed for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications
