Chevrolet and GM Performance Parts - 4.00” Bore Cast Iron SB2/SB2.2 Racing Bow Tie Bare Block

Chevrolet - 4.00” BORE CAST IRON SB2/SB2.2 RACING BOW TIE BARE BLOCK

This block is “CNC” machined from a raw casting P/N 10051184 and is machined indentically to block P/N 24502503 except the lifter bore locations have been revised to match the SB2 or SB 2.2 cylinder head.

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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

Picture is of P/N 24502503, 4.00 Inch Bore Cast Iron Racing Bow Tie Bare Block

4.00” Bore Cast Iron SB2/SB2.2
Racing Bow Tie Bare Block
Picture is of P/N 24502503, both blocks are simular.

P/N 24502600
This block is “CNC” machined from a raw casting P/N 10051184 and is machined indentically to block P/N 24502503 except the lifter bore locations have been revised to match the SB2 or SB 2.2 cylinder head. All traditional racing modifications are provided by the factory. The heart of this block starts with a siamesed bore cylinder case at a 3.995” bore, but can be bored to 4.155”. 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 drilled and tapped for pipe. 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° 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 two-stud (7/16” dia.) configuration and utilizes a two-piece rear seal design. After installation of the steel bearing caps, the block is align bored. Use cam bearing kit P/N 12370843 only.
Technical Notes: Production blocks can be used if offset roller rockers and roller tappets are used. Must use special camshaft when using SB2 or SB2.2 cylinder heads. 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; Early model two-piece rear main seals; Uses pre-1986 oil pans; and Uses premium quality studs and 8620 20° steel splayed main bearing caps.

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
9.025”
3.995”-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:

2.45”
Wet
2 piece
3.75”
183
700 @ 8500
Professional Compitition