Chevrolet and GM Performance Parts - Bow Tie CNC Racing Bare Block (Short Deck)

Chevrolet - BOW TIE CNC RACING BARE BLOCK “SHORT DECK”

Description Goes Here

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Updated 09-08-2004.

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BOW TIE SMALL-BLOCK BARE BLOCK NAVIGATION

Street 10051181	Street 10051183	Amateur Comp. 10185047	Sportsman 12480047	Sportsman 12480049
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DESCRIPTION

Bow Tie CNC Racing Bare Block (Short Deck)

P/N 24502650
This “CNC machined” cast iron bow tie block has an 8.200” deck to crankshaft, compared to the standard block with a 9.025” deck. 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 3.894” and can be bored to a maximum of 4.190” with a minimum wall thickness of .250”. The camshaft has been raised up 4.953” and the main oil gallery relocated from above the camshaft to the side of the cam. 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 and 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 20°, and the block weight is approximately 167 lbs.
Technical Notes: This block uses the Oldsmobile Aurora V8 design bell housing with a maximum of 12.25” diameter flywheel. These blocks also use early style two-piece rear oil seals with late model one-piece molded oil pan gaskets. 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. They uses a dry sump oil system only and have 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 in testing.

SPECIFICATIONS:

Block Material:
Cylinder Wall Type:
Cylinder Deck Height:
Cylinder Bore Range:
No. Bearing Cap Bolts:
Cap Bolt Orientation:
Bearing Cap Type:

Cast Iron
Siamesed
8.200”
3.900”-4.155”
4
Splayed 20°
8620 Steel

Crankshaft Journal Dia.:
Oil Sump Type:
Crankshaft Seal Type:
Design Max. Stroke:
Weight (lbs. - bare):
Intended Max. Hp @ RPM:
Intended Usage:

2.30”
Dry
2 piece
3.25”
167
700 @ 8500
Professional Compitition