Chevrolet and GM Performance Parts - Small Bore Cast Iron V8 Racing Bare Block

Chevrolet - SMALL BORE CAST IRON RACING BARE BLOCK

This Bow Tie bare block is intended for serious competition applications right out of the box. This block is “CNC” machined from a raw casting P/N 10051182.

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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
Racing 24502501	Racing 24502503	Racing 24502525	SB2 / SB2.2 24502600	Racing 24502650
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DESCRIPTION

Small Bore Cast Iron
V8 Racing Bare Block

P/N 24502501
This Bow Tie bare block is intended for serious competition applications right out of the box. This block is “CNC” machined from a raw casting P/N 10051182. All traditional racing modifications are provided by the factory. The heart of this block starts with a non-siamesed cylinder case raw casting P/N 10051182 at a 3.875” bore, but can be bored to 4.030”. This case is then blueprinted on the cylinder decks (9.025” deck height), front of case, rear of case, and oil pan rail surfaces as well as the head dowel locator pin locations. In addition, all galleries required for dry sump oil system operation are oversize and tapped for pipe plugs. 8620 steel bearing caps are installed on all locations on the block. The intermediate main bearing caps have the outer 7/16” diameter studs installed at a 20 degree splay, while the front bearing cap has 7/16” diameter studs on the inner locations and 3/8” diameter straight bolts on the outer locations. The rear bearing cap is a 2 stud (7/16” dia.) configuration and utilizes a two piece rear seal design adaptable to the one piece design. After installation of the steel bearing caps, the block is align bored. Use cam bearing kit P/N 12370843. They are 2.00” O.D. and 1.867” I.D.
Technical Notes: The above bore sizes are after honing .005” from the cylinder by a professional engine builder. Special features are: Priority main oiling; Bearing cap inner bolts spread .210 to allow use of “2.65” dia. journal cranks on properly modified blocks; Sonic bore check (data provided); Enlarged cam bosses front and rear to allow use of larger bearings; Enlarged lifter bosses; Production .842” lifter bores; Early model two-piece rear main seals; Uses pre-1986 oil pans; Uses premium quality studs and 8620 20° steel splayed main bearing caps; and Billet wet sump rear main cap can be adapted to dry sump with plugs.

SPECIFICATIONS:

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

Cast Iron
Non-Siamesed
9.025”
3.875”-4.030”
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:

2.45”
Wet
2 piece
3.75”
183
650 @ 8500
Professional Compitition