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Chevrolet - 502 HO ENGINE ASSEMBLY CRATE ENGINE | |
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The 502 high-output engine offers exceptional performance and value in an over-the-counter package for off-highway applications. With the 502 HO, you can experience the axle-twisting torque created by GMPP's legendary 502ci Rat engine at a more economical price. 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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502 HO DESCRIPTION | |
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502 HO ENGINE ASSEMBLY - 8.2L (502ci) High Output Chevrolet Big-Block V8
P/N 12568778 (Old P/N’s 24502626, 10185085)Maximum displacement with maximum value! This high-torque engine offers exceptional performance and value in an over-the-counter package for off-highway applications. During development of the 502 HO assembly, a test engine equipped with a 750cfm Holley four-barrel carburetor, aftermarket headers (2” x 30” primaries) and low-restriction mufflers produced 450 horsepower at 5250 rpm and 550 lb-ft torque at 3500 rpm. Starting with a GEN VI four bolt main block, GM filled it with forged pistons, forged 4340 steel shot-peened connecting rods with 7/16” bolts,a 1053 forged steel crankshaft, and a steel roller camshaft. GM next torqued down a pair of big breathing rectangular port heads with 2.19” intake and 1.88” exhaust valves. With the 118cc combustion chambers yielding a streetable 8.75:1 compression ratio of these heads, this engine is ready to rock on readily available premium gas. High Output 502 engines are completely assembled (less ignition, spark plug wires, carburetor, and exhaust manifolds) using brand new, premium quality components. The 502 HO assembly includes an aluminum dual plane intake manifold, cast iron water pump, 8” damper, 6 quart oil pan with windage tray, and a 14” automatic transmission flexplate. All you need now are carb, HEI ignition system, headers with 2” x 30” primaries, low restriction mufflers, and a vehicle with sticky tires. The 502 HO is not intended for marine use, and should only be used in 1976 and earlier Pre-emissions street vehicles or any year off road vehicles. |
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Notes: • GMPP crate engines are not intended for marine use. There is no warranty on this engine if used for marine applications. If you want a marine engine with a warranty, we suggest you buy a marine engine from a GM marine engine dealer. • GMPP crate engines come with a twelve month, 12,000 mile warranty. See the Information section of the Chevrolet Web site to obtain a copy of this warranty. • GMPP engines are brand new and do not contain any used or remanufactured parts except some crate engines may come with a remanufactured starter. • This engine is intended to be used in 1976 and older pre-emissions street vehicles. Applications for this engine are for street use, the weekend street/strip drag racer, the weekend street/road road racer or any strictly off road only application where the use of this engine in that application would be emissions legal. Check with your local authorities for the emissions laws and standards in your area to see if this engine will be usable in your application. It is illegal for dealers to knowingly sell parts to people that will aid those people in breaking emissions laws. • GMPP engines are not intended for nitrous, alcohol, supercharger, or strictly racing applications and require some prep work prior to use in these applications. Failure to properly prep an engine for these applications may and can result in engine damage. Altering these engines can also result in the GMPP warranty being violated. Check with your GMPP dealer to make sure that any alterations you plan will not violate the GMPP warranty prior to making these alterations. |
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502 HO FEATURES | |
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Block: The 502 HO is based on the Gen VI cast iron short-deck marine block with 4.466”
diameter siamesed cylinder bores, four-bolt main bearing caps, and blind-tapped head bolts. Like
all Gen VI big-block V8s, 502 has a leak-resistant one-piece rear crankshaft seal, relocated oil
passages, and a redesigned oil filter pad with integral oil cooler connections. It has no mechanical
fuel pump boss, so it requires an electric fuel pump. Crankshaft Assembly: A 4.00” stroke forged 1053 steel crankshaft is the heart of the 502 HO engine. The crank assembly also includes forged 4340 steel connecting rods with 7/16” bolts and forged aluminum pistons with a nominal compression ratio of 8.75:1. Induction System: The 502 HO is equipped with a high-rise aluminum four-barrel intake manifold and rectangular port cylinder heads. These cast iron heads have open-style 188cc combustion chambers and 2.19/1.88” diameter valves. Rocker Covers: The 502 HO’s rigid cast aluminum covers and screw-in oil filler cap resist oil leaks. Valvetrain: The 502 HO engine’s new hydraulic roller tappet camshaft (#24502611) has .511/.540” valve lift and 211/230 degrees duration (at .050” tappet lift). The HO engine uses a non-adjustable “net lash” roller tappet valvetrain and 3/8” diameter pushrods. |
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502 HO SPECIFICATIONS | |
| Part Number: | 12568778 (Old P/N 24502620) |
| Engine Type: | Chevrolet big-block V8 |
| Displacement: | 8.2-liter (502 cubic inches) |
| Bore/Stroke: | 4.466” x 4.00” |
| Horsepower: | 450 @ 5250 RPM |
| Torque: | 550 Ft. Lbs. @ 3,500 RPM |
| Compression Ratio: | 8.75:1 |
| Max. Rec. RPM: | 5,000 |
| Oil Pres. (Normal): | 40psi @ 2000 rpm |
| Fuel Pres. Required: | 5 to 8.5psi |
| Spark Timing: | 36° total advance at 3600 rpm (distributor vacuum advance line disconnected and plugged) |
| Firing Order: | 1-8-4-3-6-5-7-2 |
| Fuel: | Premium unleaded 92 octane (R+M/2) |
| Valve Lash: | Net Lash |
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502 HO PARTS LIST | |
| Pistons: | 12533507 Forged Aluminum |
| Pistons Rings: | 12524293 |
| Rocker Arms: | 12523976, 1.7:1 Ratio, Stamped Steel Kit |
| Rocker Arm Studs: | 10114123 |
| Torsional Damper: | 10216339 8”, counterweighted |
| Flexplate: | 10185034 14” diameter |
| Camshaft: | 24502611 Steel Hydraulic Roller Tappet, Duration (211° I, 230° E @ .050” Lift), Valve Lift (510” I, .540” E) |
| Oil Pan: | 10240721 6 quart with windage tray, pickup oil pan |
| Oil Pan Gasket: | 10106407 |
| Oil Filter Adapter: | 03853870 Gen 5 & 6 Oil Filter Fitting |
| Oil Pump: | 12555167 Oil Pump, screen, and tube. |
| Oil Pump Shaft: | 03998289 |
| Oil Filter: | Short (ACDelco PF454, GM 25324052), Long (ACDelco PF1218, GM 25160561) Comes with long. |
| Engine Block: | 10237292 Cast iron with four-bolt intermediate main bearing caps |
| Crankshaft: | 10183723 Forged 1053 steel, one-piece rear seal, externally balanced, nitrided, and cross drilled. |
| Timing Chain: | 12371053 502 Kit. Includes 12550039 crankshaft sprocket, 12551401camshaft sprocket, 10114177 timing chain, 10168501 camshaft retainer, 09424877 3 hex camshaft sprocket bolts, and 14093637 2 camshaft retainer bolts. |
| Connecting Rods: | 10198922 Forged 4340 steel, 7/16” bolts, shot-peened |
| Cylinder Heads: | 12562920 Cast iron, rectangular intake ports, 118cc open chamber, 3/8” rocker stud holes. |
| Head Gaskets: | 12366984 Additional opening for improved cooling on 502 engines. Compressed thickness of .041”. |
| Valve Diameter: | 14097045 2.19” Intake, P/N 14097049 1.88” Exhaust |
| Valve Spring: | 14097002 Dual, 1.487” O.D., pressure @ installed height (110# @ 1.88”) |
| Valve Spring Cap: | 12360874 Retainer (Cap) and Seal Kit, 16 retainers 12550421, and 16 seals 12550422 |
| Valve Stem Key: | 03947880 |
| Valve Spring Shim: | 03875916 |
| Push Rods: | 12368081 High performance kit, roller lifter design, 1010 steel, .058” wall thickness. 8 Intake 10227762 (3/8” x 7.575”), 8 Exhaust 10227763 ( 3/8” x 8.525”) |
| Push Rod Guide Plate: | 14097005 |
| Lifters: | 12371056 Kit, 16 roller tappets 17120061, 8 tappet guides 12551397, 1 tappet guide retainer 125599, 4 09440224 tappet guide retainer bolts. |
| Intake Manifold: | 03933163 Aluminum, rectangular intake ports, standard flange Holley four-barrel mounting pad. |
| Intake Manifold Gskt: | 12506106 Restricted heat crossover passage. |
| Water Pump: | 12484890 Cast Iron, Long Leg |
| Valve Covers: | 12553666 LH, 12553667 RH, both black powder coated |
| Valve Cover Gasket: | 10126727 2 gasket set |
| Spark Plugs: | MR43T Gap .045, #10 Rapid Fire Gap .045 |
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Technical Notes: • P/N 10185085 was the original part number and used a High-Performance hydraulic flat tappet camshaft and lifters. P/N 24502626 changed to a steel cam with roller lifters. • This is not a complete engine but more like a long-block plus. You will still need a carburetor, fuel pump, starter, distributor, and other parts to make this a complete turnkey engine which Chevrolet can supply you with if needed. • The 502ci engine assembly includes a 14” diameter automatic transmission flexplate with dual bolt patterns (P/N 10185034). For manual transmission applications, a 14” diameter flywheel drilled for an 11” clutch is available as P/N 14096987. Due to differences in crankshaft counterweights, this flywheel should be used only with the forged steel crankshafts installed in 454 HO and 502 HO engine assemblies. • Distributor (P/N 93440886 or 88961867) or melonized distributor gear (P/N 10456413) must be used on all crate engines with steel camshafts. • The 502 HO engine assembly includes a six quart oil pan. When installing a Gen 5 or Gen 6 big-block in most Chevelles, Camaros, or similar chassis, the pan and oil pump must be modified to clear the front crossmember or use the 4 quart oil pan kit P/N 12495360. • The 502 HO requires an electric fuel pump because the 502 Gen 6 block does not have a fuel pump boss. • The clutch linkage boss is cast into the block but it must be drilled and tapped. • When using cast iron exhaust manifolds, the lower head bolts will need to be replaced with head bolts that have shorter heads if there are clearance problems. |
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OTHER PARTS THAT WILL WORK WITH THE 502 HO | |
| Starter | 09000852 - Gear Reduction, Light Weight |
| Distributor | 93440806 - GM HEI (Use connector P/N 0891705 to attach tach wire.) 88961867 - GM HEI High Quality with vacuum advance canister included. 10134355 - GM, Electronic Distributor, no mechanical tach drive, no mechanical advance, tailorable spark curve. Use with electronic tachometers 10038474, 10185001, or 10185002. Requires the heavy duty ignition control box 10037378 and heavy duty ignition coil 10037380. The Rev Limiter 10037379 (limits at 6000, 7000, and 8000 RPM) is not required but is recommended. 85551 - MSD, Pro-Billet Chevrolet V8 (6402 6AL box and either 8202 or 8207 blaster coil needed). |
| Distributor Gear | 10456413 - GM, Melonized (hardened) A new hardened gear must be used with new steel camshafts when using a used distributor. The distributors listed above come with a hardened gear. |
| Rocker Arms | 12361323 - GM, Aluminum Roller Rocker Arm Kit, 1.7:1 ratio full roller design (Qty. 16), balls and nuts included. 12368085 - GM, Hardened Stamped Steel Kit, clearance for .600” camshafts (16 each of nuts, balls, and arms). |
| Rocker Studs | 12495518 - Rocker Arm Stud Package, 3/8-16 thread, 7/16-20 upper shaft for nut. For installation of adjustable tappets, Use with rocker arm kit P/N 12368085 only (Qty. 16). |
| Valve Covers | 12342093 - GM, Short Chrome (Proform 141-114). Use rocker cover gasket P/N 14085759. 12342099 - GM, Tall Chrome (Proform 141-115) provide clearance for roller rocker arms. Use rocker cover gasket P/N 14085759. 12495488 - GM Custom aluminum, work with stock stamped steel rockers P/N 12523976. Will work with roller rockers P/N 12361323 with modifications (Mill out drippers plus .030” more and .200” shorter poly locks.). 502 Decals required for these valve covers, 12363953 502 Cubic Inches or 12366964 502 GMPP logo, 1 decal in package, 1 decal required per valve cover, purchased separately. Use rocker cover gasket P/N 14085759. 12371244 - GM Aluminum, plain, competition design, raised Bow Tie and "Chevrolet". Use rocker cover gasket P/N 14085759. Two per box. 25534323 - GM Aluminum, black powder coat, competition design, raised Bow Tie and "Chevrolet". Use rocker cover gasket P/N 14085759. Two per box. 25534374 - GM Aluminum, orange powder coat, competition design, raised Bow Tie and "Chevrolet". Use rocker cover gasket P/N 14085759. Two per box. |
| Carburetor | 12485506 - Holley 750cfm (model 4160), four-barrel, dual-feed, vacuum secondaries, electric-choke. 12366996 - Holley 850cfm (model 4150), four-barrel, dual-feed, vacuum secondaries, electric-choke. |
| Water Pump | 14058915 - GM Aluminum, short leg, dual-bolt patterns for early and late-model pulleys. Used for early design V-belt drive rotation. |
| Flywheel | 14096987 - GM, for manual transmission applications, 14” diameter, drilled for an 11” clutch |
| Plug Wires | 12361052 - GM, Chevrolet Bow Tie logo, 8mm, red, 135° boots, 600 ohms/foot resistance, route over valve covers. 12361058 - GM, GM Performance Parts logo, 8mm, red, 135° boots, 600 ohms/foot resistance, route over valve covers. 12368383 - GM, GM Performance Parts logo, 8mm, red. Use with black loom kit P/N 12495502 or chrome loom kit P/N 12342049 (Proform 141-639). 12368384 - GM, Chevrolet Bow Tie logo, 8mm, red. Use with black loom kit P/N 12495502 or chrome loom kit P/N 12342049 (Proform 141-639). |
| Wire Looms | 12495502 - GM economical black loom kit 12342049 - GM Chrome linear looms (Proform 141-639) |
| Wire & Loom Kit | 12495078 - 12368383 8-mm red silicone with GMPP logo and 12495502 black looms 12495079 - 12368384 8-mm red silicone with Chevrolet Bow Tie logo and 12495502 black looms |
| Fuel Pump | 25115899 - High Output electric fuel pump, no regulator required. The 502 HO requires an electric fuel pump. |
| Turnkey Kit | 12498733 - GM Deluxe Serpentine Accessory Belt Drive System (A/C, Alt., W/P, and Power Steering) |
| Air Cleaner | 12342080 - Chevrolet logo 14” high performance air cleaner. Any 14” GM air cleaner will work. See our Proform Section for choices. |
| Oil Pan | 12495360 - GM, 4 quart, should fit most early model Chevelle and Camaro vehicles. 502 stock windage tray must be removed for this pan to bolt onto the 502 HO and no windage tray comes with this pan. Includes four main cap bolts P/N 10106461, oil pump tub and screen P/N 03955281,oil dipstick tube P/N 00329231, oil dipstick P/N 03989391, oil pan gasket P/N 10106407. 20411 - Moroso, 6 quart, fits most GM chassis applications including 1965-1972 Chevelle, Cutlass, Skylark, Tempest/GTO. Works with 502 main-cap-mounted windage tray. Moroso 2440 oil pickup tube and screen along with Moroso dipstick kit 25970 required. Use GM oil pan gasket P/N 10106407. 20413 - Moroso, 6 quart, fits most Gen V/Gen VI applications including 1964-1972 Chevelle, Cutlass, Skylark, Tempest/GTO. Works with 502 main-cap-mounted windage tray. Moroso 2440 oil pickup tube and screen along with Moroso dipstick kit 25970 required. Use GM oil pan gasket P/N 10106407. 30955 - Milodon, 7 quart, low profile, fits all Chevy chassis, including 1966 & 67 chevelles, except 1962-1967 Nova, 8-1/2” deep sump. 41002 1-piece gasket and 1830 pickup tub with screen required. Use with existing 502 baffle, dipstick, and oil pump. |
| Oil Pump | 10051105 - GM High Volume pump. Use with the correct screen and tube for your oil pan. |
| Oil Pump Shaft | 03865886 - GM Gen 5 & 6, heavy duty, all-metal |
| Oil Drain Plug | 23011420 - GM Magnetic oil drain plug. Catches and holds small pieces of metal. (engine damage indicator) |
| Oil Primer | 12368084 - GM Engine Oil Primer. Primes engine with oil before you start up your engine for the first time. |
| Engine Lift Kit | 12363238 - GM Universal Engine Lift Bracket Kit. Used for lifting GM engines. Brackets bolt to ends of cylinder heads for lifting engine. Includes two .020” thick steel epoxy coated brackets and two 7/16” bolts. Bracket will accept 3/8” or 7/16” mounting bolts and have a .88” x 1.00” hole for hooking too. |
| Engine Oil Sup. | 01052367 - GM engine oil supplement (16 oz.) Oil additive designed to reduce engine wear. Recommended for use before firing up a new crate engine, a new camshaft install, and normal engine use to help prolong engine life. |
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