12499120 Ram Jet 350-PFI W/Iron Vortec Heads

Part Number: 12499120

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Chevrolet Performance Ram Jet 350 crate engine package. Complete engine assemble from top to bottom, add fuel, 12 volts and let your imagination run wild!.. This GM Performance engine #12499120 is a great choice for adding a nostalgic look to a true muscle machine. Great Horsepower, torque and reliability make it a real show stopper! Add some GM Muscle to your next project... 

General Motors Warranty Information

Ram Jet 350 Installation Guide

Select the parts below to finish your crate engine and get running in less time!

24216083 4L60-E Tour-Speed Automatic Transmission

19212657 Transmission Controller

12361146 High Torque Mini Starter

12342024 Chrome Water Neck

12497698 Serpentine Accessory Drive System


• Comes with externally balanced, manual transmission flywheel; change to externally balanced flexplate for automatic transmission applications. 
• Installer to supply 12-volt power source and fuel
• See instructions for fuel pump recommendation
• Designed for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications
• IMPORTANT! For a safe, proper and trouble-free engine break-in, the MEFI 4 computer has a “green” mode that controls rpm during the break-in period. During this period, engine speed is limited to 4,000 rpm in the first hour, 4,500 rpm in the second hour and 5,500 rpm in the third hour

Part Number: 12499120
Engine Type: Chevy Small-Block V-8
Displacement (cu in): 350
Bore x Stroke (in) : 4.000 x 3.480
Block: Cast iron with 2-bolt main caps
Crankshaft (P/N 10243068): Cast-iron
Connecting Rods (P/N 10108688): Powdered metal steel
Pistons (P/N 12571703): Hypereutectic aluminum
Camshaft Type (P/N 14097395): Hydraulic roller
Camshaft Lift (in): .460 intake / .481 exhaust
Camshaft Duration (@.050 in): 196° intake / 206° exhaust
Cylinder Heads (P/N 12528913): Vortec iron; 64cc chambers
Valve Size (in): 1.940 intake / 1.500 exhaust
Compression Ratio: 9.1 nominal
Rocker Arms (P/N 12367346): Aluminum roller style
Rocker Arm Ratio: 1.6
Recommended Fuel: 92 octane
Ignition Timing: Base 10° BTDC, 32° Total
Maximum Recommended rpm: 5,500
Balanced: External