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10237292
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Bare Block "502"
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This Gen VI cast iron block is a strong foundation for a big-block engine project. The "short-deck" block was designed to meet the needs of a powerful and dependable 500cid engine for street or boat usage. The block's cylinder walls are "siamesed" and are bored to 4.47". The deck surfaces are reinforced to improve the head gasket sealing. Four-bolt main bearing caps are installed to reinforce cylinder barrels and add strength to the bottom end.
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Technical Notes: The distance from the crankshaft centerline to the deck surfaces is 9.80". It is used on 502 engines assembly, and partial engine. and can use roller tappet or stndard tappet. Casting P/N 10237300. Maximum over bore is 4.500".
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12370850
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ZL1 Aluminum Big Block
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The Chevrolet ZL1 Aluminum Big Block is back and better than ever. This block was first introduced in the 1969 Corvette and Camaro. It was one of the rarest production engines ever built. Now the improved version is available. This block is based on the original tooling. The new casting is made from 356-T6M aluminum alloy and has a 4.118" cast iron liner that can be bored to 4.300". The bottom end has also been improved with new four-bolt splayed steel main caps, with dowel pins to locate and hold the caps in place. This block includes screw-in freeze plugs with o-ring seals, and a two-piece rear seal. The new block has a provision for both dry sump or regular oil pump systems and mechanical fuel pump. All GM performance cylinder heads will fit this block and it only weighs 110 lbs. The maximum stroke is 4.375".
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12550307
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Bare Block 427/454ci
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This is a special Gen VI bare iron block with 4.25" cylinder bores with four-bolt main bearing caps. It has a machined fuel pump pad, one-piece rear main seal design and standard 454 deck height.
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Technical Notes: The maximum cylinder bore is 4.25" plus .060" O.S. and will require the "Gen V/GenVI" design one-piece oil pan. Casting P/N 12550313
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24502502
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Gen VI CNC Machined Tall Deck Racing Bow Tie Pro Stock Block
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The Gen V Pro Stock Bow Tie bare block has been the standard for the serious pro stock or boat racer. The Bow Tie block has siamesed cylinder walls, and a two-piece rear main oil seal. Some of the standard features of this block are: extra thick deck surfaces with blind tapped head bolt holes, priority main oiling, no mechanical fuel pump boss, improved coolant flow around the No. 1 cylinder, and inner head bolt bosses. This block also has steel four-bolt splayed bearing caps. Mark IV style cylinder heads can be used on this block.
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24502619
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502ci (8.2L) Partial Engine
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For those who need the max, here's an 502ci Gen VI Chevrolet big-block with roller camshaft. This block is identical to the Gen V block, but has a new roller camshaft design block. The pistons, rods and crankshaft are the same as Gen V. This engine features a standard deck height "iron" block with four-bolt main bearing caps, a 4.00" stroke forged steel crankshaft and 4.47" diameter forged pistons. The compression ratio is a reasonable 8.75:1 when used on the 502 HO engine, with 118cc chambers cast iron heads, or 9.6:1 on the 502/502 HP engine with 110cc chamber aluminum heads. It has 4340 steel connection rods with 7/16 rod bolts. This partial includes block, crankshaft, pistons, flex plate, damper, oil pump, oil pan, front cover and steel roller camshaft with lifters. (When replaceing the 502 HO engine, the camshaft must be changed from 12366543 to 24502611.)
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Technical Notes: Starting with the Gen VI engines and blocks, Mark IV, Gen V or Gen VI iron or aluminum cylinder heads are interchangeable. The following are service items for the 502ci (8.2L) high output partial engine part number 10185059: 10237292-Bare Block "Iron"; 12533507-Piston ASM (Std.); 10244451-Piston ASM (.030" O.S.); 12524293-Piston Rings (Std.); 12523923-Piston Rings (.030" O.S.); 10183723-Crankshaft 1053 Forged Steel; 10198922-Connecting Rod (4340 Forged Steel); 10216339-Damper; 10185034-Flywheel (Flex-Plate Dual-bolt Pattern); 10240721-Oil Pan 6 Qt. (10 20 Ser Truck); 14097040-Oil Pan Baffle (Upper); 12555167-Oil Pump and Screen; 14097008-Oil Pump (Less Screen); 10230954-Front Cover; 12366984-Head Gasket Competition Design; 12366543-Camshaft; 17120061-Tappets. The balance of components required to complete this engine will be in the section "502 HO engine ASM 24502620".
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24502500
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"Gen V" Short Deck (9.800") Pro Stock Bow Tie Bare Block
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The Gen V Pro Stock Bow Tie bare block has been the standard for the serious pro stock or boat racer. The Bow Tie block has siamesed cylinder walls and a two-piece rear main oil seal. Some of the standard features of this block are: extra thick deck surfaces with blind tapped head bolt holes, priority main oiling, no mechanical fuel pump boss, improved coolant flow around the No. 1 cylinder, and inner head bolt bosses. This block also has steel four-bolt splayed bearing caps. Mark IV style cylinder heads can be used on this block.
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24502572
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Bare Block - GMPP/DRCE "2"
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This GM performance parts/DRCE 2 Bare Block is a redesigned Old's DRCE. This block was designed for competition in 500ci Pro Stock Drag Racing or similar type usage. Use with cylinder heads P/N 24502585 or P/N 12480010 only. The main differences between the Old's DRCE and these semi-finished GMPP "2" blocks are the camshaft has raised to 5.750", the deck height is a 9.300" and can be reduced to approximately 9.000", the distributor hole is moved rearward on the block, and the overall weight has been reduced approximately 11 pounds.
The cylinder bore centerline spacing has been increased from 4.840" to 4.900", the maximum legal bore spacing for NHRA Pro Stock competition. With the new bore spacing of 4.900" it will allow the use of big bore with short stroke piston and crank shaft combinations to enhance performance. The increase in cylinder bore spacing reduces valve shrouding and permits the use of larger valves to improve air flow. The semi finished cylinder is bored to 4.500" dia. maximum recommended bore dia is 4.700. New elliptical siamese cylinder barrels maximuze wall thickness on the major and minor thrust axes. This allows lighter weight piston and rod combinations and improve carburetor, manifold port alignment with pro stock type induction systems. This block's cam tunnel will accommodate a 2.166" cam bearing.
Other improvements are No. 2 and No. 4 main bearing bulkheads are relocated .060" to distribute crankshaft loads easily. The lifter bosses has been replaced with solid bar, and the lifter holes are not drilled to allow engine builders to position them for there own valve train geometry. The head bolt holes are not drilled, so the engine builder can accomodate Pontiac S/D, Oldsmobile DRCE, or Chevrolet bolt patterns. The rear flange has a hybrid patter that accommodates Oldsmobile, Pontiac, or Chevrolet bellhousing. They use new four-bolt 8620 steel main bearing caps with splayed outer bolts to improve main bearing bulkhead durability and resist bearing bore distortion under high load. The oil pan rails have been spread .400 per side to provide room for longer stroke crankshafts. The starter motor can be mounted on either side of the GMPP/DRCE Block.
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Technical Notes: This high-strength iron block has brinell hardness of 210 to 230 and requires a camshaft with distributor gear behind the rear bearing. The balance of parts to complete this engine are Chevrolet Big Block (water pumps, crank, cam, balancers, flywheel, and manifolds). This block is cast with the GM Performance Parts logo on it.
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