Bow-Tie CNC Racing Block (Short Deck) 24502650 - Crate Engine Depot
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Top > Engine Components > Small Blocks & Components > Partial Engines - Bare Blocks - Components > Bow-Tie CNC Racing Block (Short Deck) 24502650 |
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Bow-Tie CNC Racing Block (Short Deck) 24502650
SKU: 24502650
RETAIL: $5,218.57
YOUR PRICE: $4,435.79
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Bow-Tie CNC Racing Block (Short Deck) 24502650 Description
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This "CNC machined" cast iron bow tie block has an deck height that starts at 8.300" and can be machined to 3.400", compared to the standard block's 9.025" deck height. This block is designed for small cubic inch engines used in drag racing, road racing, or restricted oval track racing. The factory bore on this siamesed block is 3.980" and can be bored to a maximum of 4.190" with a minimum cylinder wall thickness of .250". The camshaft has been raised up to 4.953" to use belt style timing drives. A priority main oiling system is designed into the block and significant changes in the oiling system ensure uniform lifter gallery oil feeding as well as integral lifter oil restrictors. The water pump holes are spread and a big block water pump must be used. When a 6" or larger damper is used, the pump must be raised with aluminum adapters. With the shorter deck, the pushrods must be shorter to mate with the cam and lifters. The main bearing diameters are 2.30", not the standard 2.45". The cam bearing holes are bored for roller bearings at 2.250" diameter O.D. x 1.875" I.D. This block features five steel main caps with the three center caps splayed at 200, and the block weight is approximately 201 lbs. Technical Notes: This block uses the Oldsmobile Aurora V8 design bell housing with a flywheel maximum diameter of 12.25" . These blocks also use early style two-piece rear oil seals and oil pans. The lifter bosses are .220" taller than production blocks. These blocks will accept all V8 cylinder heads. The oil filter boss is a machined pad for a remote oil filter adapter — or tap for a fitting. The block uses a dry sump oil system only and has provisions for an integral lifter valley scavenge system. Oil is scavenged through a hole at the rear of the valley. This block does not have a manual fuel pump boss, but it features bosses for cylinder pressure transducers for development testing. (NOTE: Delivered deck height of 8.400" starting 10-10, can be decked to 8.200". All prior blocks are 8.300"). Main bearing torque specifications for all Bow-Tie blocks are 65 lbs. inner bolts, 60 lbs. outer bolts and 40 lbs. on 3/8" front bolts with light oil
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