Chevrolet Performance Ram Jet 502 - 502 Hp - GM (12499121)

Genuine OEM GM Parts & Accessories - 12499121

Discontinued Product

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Manufacturer Warranty Minimum of 12 Months
Guaranteed Fitment Always the correct parts
Shop with Confidence Your information is safe
In-House Experts We know our products
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Details

  • Brand:
    Buick, GMC, Cadillac, Hummer, Saturn, Oldsmobile, Pontiac, Chevrolet Parts
  • SKU: 12499121
  • Description:

    MAKE A STATEMENT UNDER THE HOOD!
    The Ram Jet 502 blends the legendary torque and performance of the Big-Block with a modern port fuel injection system and tunnel ram-style high-rise intake manifold. It's a combination that offers uncompromising performance - including 502 hp and 568 lb.-ft. of torque - in a visually stunning presentation.
    The unique Ram Jet fuel injection system stands 11 inches tall at its highest point and consists of a two-piece manifold/plenum assembly, eight injectors, a throttle body, and an updated MEFI 4 controller. Setup instructions are included, making it a simple, "plug-and-play" installation.
    Supporting the Big-Block's style and performance is a robust bottom end featuring an all-forged rotating assembly installed in a strong, latest-generation block casting with four-bolt main caps. It also has high-flow aluminum oval-port cylinder heads with 2.25/1.88-inch valves, and the engine package includes an aluminum short-style water pump and HEI distributor.
    TECH SPECS
    Part Number: 12499121
    Engine Type: Chevy Big-Block V-8
    Displacement (cu in): 502
    Bore x Stroke (in): 4.470 x 4.000
    Block (P/N 19170540): Cast-iron with 4-bolt main caps
    Crankshaft (P/N 10183723): Forged steel
    Connecting Rods (P/N 19170198): Forged steel, shot peened
    Pistons (P/N 12533507): Forged aluminum
    Camshaft Type (P/N 12366543): Hydraulic roller
    Camshaft Lift (in): .527 intake / .544 exhaust
    Camshaft Duration (@.050 in): 224° intake / 234° exhaust
    Cylinder Heads (P/N 12363390): Aluminum oval port; 110cc chambers
    Valve Size (in): 2.250 intake / 1.880 exhaust; stainless steel
    Compression Ratio: 9.6:1
    Rocker Arms (P/N 12675724): Stamped steel
    Rocker Arm Ratio: 1.7:1
    Distributor (P/N 1104060): HEI type
    Throttle Body (P/N 17113524): Included
    Water Pump (P/N 19168602): Aluminum, short-style
    Flexplate (P/N 10185034): 14"
    Recommended Fuel: Premium pump
    Ignition Timing: 35° Total at 4,000 rpm
    Maximum Recommended rpm: 5,800
    Balanced: External
    INSTALLATION NOTES

    • Requires a 12-volt power source (and ground), coolant, exhaust system, fuel feed and fuel return line (to the fuel tank). An in-tank fuel pump is recommended
    • Clutch linkage bosses are now drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance
    • 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
    NOTE: Distributor with melonized steel gear MUST be used with long-blocks and Partial engines with steel camshafts, or engine damage will occur.

  • Condition: New
  • Replaces: 12497323
  • Sold In Quantity: 1

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