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Chevrolet - RAM JET 502 | |
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The GMPP Ram Jet 502 is fuel injected dependability with commanding style! The one-second cold starts, no stalling, instant throttle response, and the solid pull from idle to red line will convince you that a Ram Jet 502 is for you. Keys - allengine, scperformanceeng, gmperformanceeng, gmgoodwrencheng. Use allengine for a complete list of all three. |
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ZZ 502/502 NAVIGATION | |
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RAM JET 502 DESCRIPTION | |
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RAM JET 502 - FACTORY FUEL-INJECTED BIG-BLOCK POWER
P/N 12499121 [Old P/N 12497323]
The recipe is simple; one part attitude, one part driving perfection, one part leading factory
technology, and five hundred and two parts hungry rat motor. Ram Jet 502, you either have one, or
you want one! When the idea of an all new big block fuel injection system first came up, we all
thought it was a good one. When it was proposed that it be integrated with our 502 crate engine,
we thought someone had clearly lost their mind. Who could possibly need the awesome, flat, broad
torque curve only available with a long runner dry manifold? And who would want the neck-snapping
throttle response of MEFI 4 controlled port fuel injectors? And what would be the need for
aggressive tunnel ram styling? But then we remembered we’re not building 100 mile per gallon,
0 to 60 in a week, eco scooters. We’re in the hot rod business! So we called together engine
management system experts from GM Powertrain, our own GMPP engineers, and fuel injected race
engine builder and GMPP Pro Mod racer Harold Martin. After some great discussions, a little debate,
a lot of late nights and 50 gallons of coffee we had an intake manifold design like no other. By
leveraging leading fuel management technology, numerous production developed components, the
industry standard MEFI 4 controller and the great Ram Jet name from the 50’s, the Ram Jet 502 is
reality.The new undisputed heavy weight champion, the Ram Jet 502, makes 502 horsepower at 5100 rpm and 565 ft.lbs. of torque at 3200 rpm. The instantly throttle responsive Ram Jet 502 drives like no other big block you’ve ever driven. With over 500 ft. lbs. of torque from 2,200 to 5200 rpm, the Ram Jet 502 is a tire shredding monster making more torque throughout its operating range. This is possible because Ram Jet has a larger plenum and runners than would ever be possible in a carbureted application. This means greater intake efficiency and greater torque without sacrificing driveability. The Ram Jet manifold is so efficient that we’re able to make all of this horsepower and torque with a production L98 throttle body assembly, you know, the one that Firebird and Camaro owners always replace when trying to make more power in their 350 engines. It’s all about airflow quality, velocity, and fuel and spark management. You’ll just have to drive one to appreciate it. If the one-second cold starts, no stalling, instant throttle response, and the solid pull from idle to red line don’t convince you that a Ram Jet 502 is for you, then maybe you would be more interested an a competitor’s futuristic dream of a 100 mile per gallon, 0 to 60 in a week, eco scooter or a good old fashion bicycle for those weekend events to impress all your friends at the local hot rod club or for those weekend cruses out on the highway to impress everyone else on the road. The Ram Jet 502 is designed for ease of installation needing only 12V, ground, fuel feed and fuel return to run. Included are an instruction sheet, service manual and diagnostic tool for ease of installation and service. As with any GM Performance Parts Ram Jet engine, an in tank fuel pump is recommended to avoid possible vapor lock. See instruction sheet for fuel pump recommendations. Also included is complete throttle linkage that accepts your production throttle cable and transmission cable. Includes pre-programmed MEFI 4 ECM and wiring harness. This revised electronic and closed loop system gives a much smoother idle and better performance then the MEFI 3 ECM system it replaced. The Ram Jet manifold stands eleven inches tall as measured from the front and rear “china wall” on the cylinder block. That’s just half an inch taller than a typical single plane high rise manifold, Holley carb and air cleaner combo. |
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RAM JET 502 TECHNICAL INFORMATION | |
| Horsepower: | 502 @ 5100 RPM |
| Torque: | 565 @ 3200 RPM |
| Max. Rec. RPM: | 5800 RPM |
| Compression Ratio: | 9.6:1 |
| Displacement: | 502 C.I.D. |
| Bore & Stoke: | 4.47” & 4.00” |
| Block: | 10237292 - Cast Iron, Standard Deck Height, 4-Bolt Main |
| Crankshaft: | 10183723 - 1-piece Rear Main Seal, 1053 Forged Steel, Ext. Balanced, Nitrided, Cross Drilled |
| Connecting Rods: | 10198922 - 4340 Forged Steel, Magnaflux Inspected and shotpeened, HD 7/16” Diameter Rod Bolts |
| Pistons: | 12533507 - Forged Aluminum, Standard Size, Pressed Pin |
| Piston Rings: | 12524393 - 502 Standard Size |
| Camshaft: | 12366543 - Steel Roller Duration @ .050” (224° I, 234° E), Lift (.527” I, .544” E), Valve Lash 0, 110° Lobe Centerline |
| Lifters: | 17120061 - Hydraulic Roller |
| Cylinder Head: | 12363390 - Oval Port, A356-T6 Aluminum, 110cc Semi-Open Combustion Chambers, Semi-finished Bronze Alloy Guides, 290cc Intake Runners, Square Exhaust Ports, Accept All Stock Accessory Brackets Except Gen V. |
| Intake Valves: | 12366987 - 2.25”, Stainless Steel, 11/32” Stem |
| Exhaust Valves: | 12366988 - 1.88”, Stainless Steel, 11/32” Stem |
| Valve Springs: | 12462970 - Dual Spring, 1.514” O.D., Press. @ Inst. Hgt. 140# @ 1.940”, Solid Hgt. 1.20”, #'s Per Inch 368 |
| Head Gasket: | 12363411 - Competition, 4.500”, Nominal Compressed Thickness .039”, Compressed Volume 10.5cc |
| Damper: | 10216339 - 8” |
| Oil Pan: | 10240721 - 6 Quart, Pickup Oil Pan |
| Oil Pan Baffle: | 14097040 - Fits Oil Pan 10240721 |
| Oil Pump & Screen: | 12555167 - Pump Has 1.3” Long Gear. Distance Between Mounting Surface and Screen bottom 5.87” |
| Oil Filter: | 25324052 - Comes With PF 454 (Short), 25160561 - PF 1218 (Long) |
| Timing Cover: | 10230954 - Aluminum With Timing Indicator |
| Rocker Arms: | 12368082 - Hardened Stamped Steel, Long Slot For High-Lift .600” Camshafts, 1.7 Ratio, Ball & Nut Included. |
| Distributor: | 01104060 - HEI Type |
| Throttle Body: | 17113524 - Included |
| Water Pump: | 14058915 - Short Leg, Aluminum, Reinforced Snout, Large Dia. Hub W/Dual-Bolt Patterns (early & Late) |
| Spark Plugs: | 25164642 (Rapid Fire #4) Gap @ .045 |
| Spark Plug Wires: | 12368383 - 8mm Red, “GM Performance Parts” Logo |
| Wire Looms: | 12495502 - Wire Loom Kit, Black; Optional 12342049 Chrome Available At Extra Cost |
| Starter: | 09000852 - Gear Reduction, For Large 14” 168 Tooth Flywheels/Flexplates |
| Flexplate: | 10185034 - 14”, 168 Teeth, Dual-Bolt Pattern Design |
| Ignition Timing: | 8° BTDC @ 800 RPM (Computer Controlled) |
| Lower Manifold: | 12464482 - Aluminum |
| Upper Manifold: | 12464484 - Aluminum |
| Fuel: | 92 Octane Premium Pump Gas |
| **** The Ram Jet 502 does not come with an air filter as pictured above. **** | |
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Technical Notes: 1) The computer has a “green mode” that controls the RPM’s for the brake in period of the engine. From start up to the end of the first hour of operation the maximum RPM is 4,000, the second hour of operation is limited to a maximum of 4,500 RPM, the third hour of operation is limited to a maximum of 5,500 RPM, and the fourth hour is limited to 5,800 RPM. 2) For Specific internal engine specifications, refer to the ZZ 502/502 crate engine. 3) For use on 1979 or older vehicles or any off-road vehicles. 4) Distributor (P/N 01104060) or melonized distributor gear (P/N 10456413) must be used on this crate engine with its steel camshaft. 5) The Ram Jet 502 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 to avoid possible vapor lock. 6) A clutch linkage boss is cast into the block, but must be drilled and tapped. When using cast iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance. |
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RAM JET 502 - P/N 12497323 SERVICE PARTS LIST | |
| P/N | Description |
| 12486610 | MANUAL, SERVICE, BIG-BLOCK RAM JET |
| 12489400 | TOOL, DIAGNOSTIC TROUBLE CODE |
| 12464484 | MANIFOLD, UPPER INT MANIFOLD |
| 12464482 | MANIFOLD, LOWER INT MANIFOLD |
| 12489372 | GASKET, UPPER INT MANIFOLD |
| 12490255 | BOLT/SCREW, INT MANIFOLD |
| 12487372 | HOSE, FUEL FEED |
| 22514722 | SEAL-O-RING |
| 12487373 | HOSE, FUEL RETURN |
| 22516256 | SEAL-O-RING |
| 10216948 | TUBE ASM-FUEL PRESS REG VAC |
| 12489494 | HARNESS ASM, ENG WRG |
| 12489595 | BRACKET ASM, TRANS CBL |
| 12490259 | BOLT/SCREW, THROTTLE CBL BRKT |
| 12489596 | BRACKET ASM, TRANS & THROTTLE CBL |
| 12489597 | ROD, THROTTLE CONT |
| 12490260 | BOLT/SCREW, THROTTLE CBL BRKT |
| 09411893 | NUT-TY/A WA INS PREV TOR10.000 |
| 01115491 | COIL ASM-IGN |
| 09000852 | MOTOR ASM, START |
| 12338064 | BOLT/SCREW, START MOT |
| 12368084 | PRIMER, OIL PUMP |
| 06487532 | VALVE,PCV |
| 09438373 | HOSE, FUEL-OIL EVAP 3/8”X24’ |
| 12555320 | SHIELD-INT MANIFOLD OIL SPH |
| 12464482 | MANIFOLD, LWR INT |
| 12366985 | GASKET PKG, INT MANIFOLD |
| 12367959 | BOLT/SCREW PKG, INTAKE MANIFOLD |
| 17090919 | INJECTOR ASM, TBI FUEL |
| 17113222 | RETAINER KIT F/INJR |
| 17120039 | RAIL ASM, M/PORT F/INJN FUEL |
| 09440033 | BOLT/SCREW-ENG WRG HARN CLIP |
| 14096659 | BOLT/SCREW-CR/SHF RR OIL SEAL |
| 17113517 | REGULATOR ASM, FUEL PRESS |
| 25179285 | RETAINER, FUEL PRESS REG |
| 12489493 | MODULE ASM, ENG CONT |
| 10456208 | SENSOR, ASM-KNOCK |
| 15326386 | SENSOR, ENG COOL TEMP |
| 01104060 | DISTRIBUTOR ASM-IGN |
| 25164642 | SPARKPLUG |
| 12368383 | WIRE KIT, SPLG*502/502*GM PERF |
| 12495502 | RETAINER PKG, SPLG WIRE |
| 12490257 | AIR CLEANER |
| BALANCE OF ENGINE SERVICE PARTS ARE SAME AS THE ZZ 502/502 LONG-BLOCK KIT | |
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