Page 139 of GM Performance Parts 2006 Catalog by GM Parts Direct

Short Deck Race Block (rear) Short Deck Race Block (front) Four-Bolt Main Caps 137 24502503 350 Cast Iron Bowtie Race Block Cast iron competition block right out of the box 4-bolt SAE 8620 steel mains, 20 splayed caps on center 3 mains 2.00" O.D. cam bearings (1.867" I.D.) P/N 12370843 required at all five locations 3.980" finished bore (siamese bores) 4.155" max bore 9.025" deck height Oil galleries for dry sump system are oversized and tapped for pipe plugs Supplied with sonic data sheet Tested to over 700 horsepower! B. 24502650 283 Main, 350 Bore size Short-Deck Bowtie Race Block CNC Cast iron competition block designed for drag racing, road racing or restricted oval track racing! 4-bolt SAE 8620 steel mains, 20 splayed caps on center 3 mains 8.325" deck (as of 10/03) (standard deck blocks are 9.025"), can be machined to 8.200" deck height Camshaft is raised 0.433" to 4.955" Cam bearing bores machined for 2.250" O.D. x 1.875 roller bearings 3.980" rough bore 4.190" max bore (minimum of .250" cylinder bore wall thickness) (siamese bores) Integral oil restrictors Must use Big Block water pump, must raise water pump with adapters for balancers larger than 6" Olds Aurora V-8 bell housing bolt pattern (12.25" max flywheel diameter) Lifter holes and cylinder head bolt holes are not drilled Will accept standard, SB2.2 and splayed valve lifter patterns Can be machined to accept any small-block Chevy cylinder head Machined as 4.400" bore and main centers, can be machined to 4.500" bore centers Shorter than production pushrods required Tested to over 800 horsepower! 12480050 283 Main, 350 Bore size Medium-Deck Bowtie Race Block CNC Cast iron competition block designed for drag racing, road racing or restricted oval track racing! 4-bolt SAE 8620 steel mains, 20 splayed caps on center 3 mains 8.700" deck (standard deck blocks are 9.025"), can be machined to 8.500" deck height Camshaft is raised 0.433" to 4.955" Cam bearing bores machined for 2.250" O.D. x 1.875 roller bearings 3.980" rough bore 4.190" max bore (minimum of .250" cylinder bore wall thickness) (siamese bores) Integral oil restrictors Must use Big Block water pump, must raise water pump with adapters for balancers larger than 6" Standard Chevy V-8 bell housing bolt pattern Lifter holes and cylinder head bolt holes are not drilled Will accept standard, SB2.2 and splayed valve lifter patterns Can be machined to accept any small-block Chevy cylinder head Machined as 4.400" bore and main centers, can be machined to 4.500" bore centers Shorter than production pushrods required Tested to over 800 horsepower! Two-Piece Rear Main Seal B B B B

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