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  • Ram Jet 350 Small Block Crate Engine
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MSRP

$7,187

Part No.

12499120

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STREET

6 Select
Available Mods

Power

Power
350
hp @ 5200 rpm

Modern performance with vintage style

Chevrolet Performance’s unique Ram Jet 350 combines the classic look of the original Rochester mechanical injection system with the dependability and optimized performance of contemporary electronic port fuel injection.

We’ve taken our proven 350 Small-Block and topped it with an exclusive port fuel-injection system that emulates the look of Chevy’s factory fuel-injection systems from the 1950s and ’60s. It’s the perfect choice for a resto-mod hot rod from the original Rochester era.

We deliver the Ram Jet 350 with the following components to make it easier to install and start:

  • Unique intake manifold and plenum that is 9.75 inches tall — plenty of clearance to fit under the hood of most vehicles without modifications
  • MEFI 4 engine controller
  • Wiring harness
  • Detailed instructions

The bottom end of the engine is our stout 350 with a brand-new block, a hydraulic roller cam, Vortec iron heads, and a pump-gas-friendly 9.4:1 compression ratio.

RAM JET 350 DYNO

Click on the slider to see the torque and power ratings change with rpm.*

*Approximate values shown.

RAM JET 350 TECH SPECS

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 two-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; 64-cc 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:
5500
Balanced:
External

OWNER RESOURCES

Already own one, but lost some of the paperwork? We’ve got you covered with downloads and links for some of the more important documents below. You’ll find everything from the vital data about your engine’s capabilities to how to install it into your build, even all of the warranty information should you need to make a claim. And don’t forget, the best way we can make sure to get you the latest information on your specific part is to tell us which one you have by registering your engine. No matter what stage of your build you’re in — from shopping for the right part to that part having turned in a few miles — we have the information you need.

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  • Ram Jet 350 Small Block Crate Engine Installation

    INSTALLATION NOTES

    • 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 4000 rpm in the first hour, 4500 rpm in the second hour, and 5500 rpm in the third hour
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FINISH OFF YOUR CRATE ENGINE WITH THESE SELECT PARTS

Download a catalog for a full listing of components and related parts.

Hydra-Matic 4L65-E Four-Speed Automatic
Transmission • P/N 19260380

Serpentine Accessory Drive System • P/N 12497698

Transmission Controller • P/N 19212657

High-Torque Mini-Starter • P/N 12361146

Download Catalog

Chrome Short Valve Covers • P/N 12341670

Chrome-Finish Aluminum Valve Covers, Center Bolt Design • P/N 12497985

  • 1 Performance MSRP The Manufacturer's Suggested Retail Price excludes tax, shipping and installation.