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Chevrolet Performance Ram Jet 350 C.I.D. 350 HP Engine Assemblies 12499120

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Engine Assembly, Crate Engine, Chevy Ram Jet 350, 350 hp, Vortec Heads, Each

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  • Order this item and get free delivery and handling on your entire order! Truck freight fees also waived on this item. Valid on orders shipped in the contiguous United States.

Manufacturer's Part Number: 12499120
Part Type: Crate Engines
Summit Racing Part Number: NAL-12499120

Engine Assembly Style: Long block
Crate Engine Cylinder Head Material: Cast iron
Assembled: Yes
Engine Balance: Internal/External
Intake Manifold Included: Yes
Cylinder Heads Included: Yes
Carburetor Included: No
Throttle Body Included: Yes
Distributor Included: Yes
Oil Pan Included: Yes
Valve Covers Included: Yes
Timing Cover Included: Yes
Water Pump Included: Yes
Harmonic Balancer Included: Yes
Flexplate Included: No
Flywheel Included: Yes
Air Cleaner Included: Yes
Spark Plugs Included: Yes
Spark Plug Wires Included: Yes
Computer Included: Yes
Wiring Harness Included: Yes
Rear Main Seal Style: 1-piece
Quantity: Sold individually.
Notes: This engine is not designed, nor intended to be used in any marine applications. Designed for pre-1976 street vehicles or any off-road vehicle. Engines installed in vehicles registered and normally operated outside of the United States carry no warranty.
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.
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Factory fuel injection for your hotrod from GM Performance. These Ram Jet 350 c.i.d. cast iron 2-bolt main, 1-piece main seal engines have approximately 9.4:1 compression with 350 hp at 5,200 rpm, and 400 ft./lbs. of torque at 3,500 rpm. These all-new 350 hp Ram Jet 350 from Chevrolet Performance make it easy to have electronic fuel injection on any 1979 or older vehicle originally equipped with a carburetor. The secret is the industry leading MEFI 4 controller. This new controller fits in the palm of your hand and was originally developed for marine applications. MEFI 4 is ideally suited for use in street rods, street machines and sportsman racers. Installation is simple; the Ram Jet 350 is an assembled 350-crate engine with Vortec cylinder heads, Ram Jet induction system, wiring harness, new MEFI 4 controller, and detailed instructions. Once installed in the vehicle, a user needs only to supply 12V power and fuel. Please note the fuel pump recommendations in the Ram Jet instruction manual. This revised MEFI4 controller has improved electronics and a closed loop capability to give a smooth idle and better performance. These crate engines are assembled with nodular iron crankshafts, powdered metal connecting rods, hypereutectic flat top pistons, hydraulic roller camshafts set to .431 in. intake lift, .451 in. exhaust lift, Degrees of duration at .050 in. for intake is 196 and 207 for exhaust, with a lobe centerline of 109. Hydraulic roller lifters, Full roller rocker arms with 1.6 ratios, Cast iron Vortec cylinder heads with 64cc combustion chambers, 170cc intake runner volume, 1.94 in. intake valves, and 1.50 in. exhaust valves. Ramjet multi-port aluminum intake manifold, standard LT1 injectors rated for 22 lbs./hr. Distributor is HEI style small cap design with external coil. AC Delco spark plugs and wires, 8 in. harmonic balancer, 14 in. manual transmission flywheel, 6 quart truck style oil pan, timing cover, chrome valve covers, high-floe air filter element, and 180 degree thermostat with chrome housing. Cast iron long style water pump with "V" belt rotation with 1979-86 power steering pump boss are used. The MEFI 4 controller is self-contained with MEFI 4 closed loop speed density controls. ECU inputs consist of O2 sensor, coolant temperature, throttle position, manifold absolute pressure, and intake manifold temperature, knock sensor. The signal ECU outputs consist of injector control, complete spark, timing control, IAC and fuel pump control. The computer has a "green mode" that controls the rpms for the break in period. From start up to the end of first hour is 4,000 rpm, second hour is 4500 rpm and the third hour is 5,500 rpm.


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1 Customer Reviews for Chevrolet Performance 12499120 - Chevrolet Performance Ram Jet 350 C.I.D. 350 HP Engine Assemblies

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Ram Jet

Summit RacingSummit Racing Verified Purchase

I purchased this unit and this is my 4th Ram Jet purchase. The installation is easy. Critical issues are correct voltage to the unit, good grounds and follow instructions to the letter. Note this engine if going to be used with an automatic transmission a 2400 stall converter will be need to be used. This is the new Gen 4 computer unit. I have had to change the computer engine control module once, defective unit. We had to have the GM techs assist us in resetting the idle speed, not hard to do, but can be done easily. I will most likely not buy another Ram Jet based upon my experience with this purchase. ...read more

2 of 2 found this review helpful.

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Reviewer: CHRIS from CA

Date: May 28, 2014

Ease of Installation

Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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