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SMALL BLOCK CHEVY
BIG BLOCK CHEVY
FORD
MOPAR
BUICK
NHRA
PRO MOD STYLE GP 18º

Designed for Pro Mod style engines, these pistons are specifically designed for nitrous applications. The precision CNC machined rings grooves are designed for .043 back cut, 1/16, 3/16 rings. Compression heights figured at zero deck clearance with listed block height. These pistons will only fit Big Chief cylinder heads.

Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS)
Vertical and lateral gas ports for maximum top ring seal

18º PRO MOD STYLE
Std Bore: 4.250 (427/454), 4.466 (502)
Ring package designed for: .043 BACKCUT, 1/16, 3/16 Rings

 Tech and Installation Tips
 Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
82cc 87cc 97cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
194964 565 4.600 4.250 6.535 9.800 1.140 15.3 14.5 13.1 13.0 611 B 0.134 J860L8-4600-5
194908 560 4.580 4.250 6.385 9.790 1.280 15.2 14.4 13.0 13.0 648 M,B 0.114 J860F8-4580-5
194909 565 4.600 4.250 6.385 9.790 1.280 15.3 14.5 13.1 13.0 654 B 0.134 J860L8-4600-5
194910 568 4.610 4.250 6.385 9.790 1.280 15.4 14.6 13.2 13.0 665 M,B 0.144 J860H8-4610-5

Error processing SSI file