Page 100 of GM Performance Parts 2006 Catalog by GM Parts Direct

WHATS HOT? 502 cubic inches Rectangular-port cylinder heads 550 lb.-ft. of torque CRATE ENGINES BIG-BLOCK 12568778 502 HO NOTE: Distributor with melonized steel gear MUST be used with engines with steel camshafts, or engine damage will occur. GMPP HEI distributor P/N 93440806 is recommended. 98 GM Performance Parts does not utilize any used or remanufactured parts in this crate engine. GM Performance Parts crate engines include a twelve-month, 12,000-mile warranty. W 502 HO TECH SPECS: Part Number: 12568778 Engine type: Chevy big-block V-8 Displacement (cu in): 502 Bore x stroke (in): 4.47 x 4.00 Block (P/N 10237292): Cast iron with 4-bolt main caps Crankshaft (P/N 10183723): Forged steel Connecting rods (P/N 10198922): Forged steel, shot peened Pistons (P/N 12533507): Forged aluminum Camshaft type (P/N 24502611): Hydraulic roller Camshaft lift (in): .510 intake .540 exhaust Camshaft duration (@.050 in) 211 intake 230 exhaust Cylinder heads (P/N 12562920): Iron rectangular port; 118cc chambers Valve size (in): 2.19 intake 1.88 exhaust Compression ratio: 8.75:1 Rocker arms (P/N 12523976): Stamped steel Rocker arm ratio: 1.7:1 Water pump (P/N 12484890): Cast iron, long-style Flexplate (P/N 10185034): 14" Recommended fuel: 92 octane Ignition timing: 36 total 3600 rpm, with vacuum advance disconnected Maximum rpm: 5500 Maximum displacement with maximum value! This is what all big-block crate engines should be: maximum power with a maximum return on your money invested. We started with the 454 that everyone loves and pumped it up to a 502 cubic inch powerhouse that delivers gobs of low-end torque and top-end horsepower. Even though the 502 is a great value, dont think for a minute that we skimped on parts or validation of those parts to the highest standard in the industry. The 502 HO bottom end consists of a cast iron four-bolt block, forged steel crankshaft, forged steel connecting rods that have been shot-peened for durability, and forged pistons. A high-lift roller camshaft controls the airflow through our legendary rectangular-port cast iron cylinder heads more than enough air to fill those hungry 502 cubes! One other key engineering feature is that the final compression ratio comes in at 8.75:1, so that when outfitted with our 502 HO, your performance GM car will make tremendous power from just pump gas. GM Performance Parts has completed this amazing crate engine with an aluminum dual-plane intake manifold, cast iron water pump, 6-quart oil pan (with windage tray), damper, and a 14" flexplate. Pick the carburetor, starter, and ignition system all available from GM Performance Parts and you are on your way to big-block bliss!

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