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V8 Oldsmobile and DRCE Big-Blocks |  Blocks |  24502572  


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24502572  - 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.  
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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