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SMALL BLOCK CHEVY
BIG BLOCK CHEVY
FORD
MOPAR
BUICK
NHRA
12º / 14º 632 Flat Top

Specifically designed for Naturally Aspirated 632 engines to fit the following cylinder heads: 12 Raptor, 12 Pro-Filer, Dart Big Chief 14 (program #'s 3815 & 384), Sonny Tru-Pro 14.5, and Brodix PB1200. Precision CNC machined ring grooves are designed for .043 back-cut top rings, .043 D-wall 2nd rings, and 3.0mm oil rings. Compression distance and compression ratio calculated with zero deck clearance at listed block height.

Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS) Rail Supports(# 4600-203)
Double Forced Pin Oilers, Accumulator Grooves, and Vertical gas ports for maximum top ring seal

12 / 14 632 Flat Top
Std Bore: Aftermarket Race Block 4.600
Ring package designed for: .043 BACKCUT, .043 D-wall, 3.0mm Rings

 Tech and Installation Tips
 Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
65cc 70cc 77cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
280263 632 4.600 4.750 6.700 10.195 1.120 16.4 15.5 14.5 -7.3 575 B STD J77008-4600-5
280265 634 4.610 4.750 6.700 10.195 1.120 16.5 15.6 14.5 -7.3 578 B 0.010 J77008-4610-5
280266 638 4.625 4.750 6.700 10.195 1.120 16.5 15.7 14.6 -7.3 583 B 0.025 J77008-4625-5

 
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