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 # Cubic
Inches		 Bore Stroke Rod
Length		 Block
Height		 Compression
Distance
Head Cubic Centimeters
82cc 87cc 97cc
Compression Ratio
Dome
Volume		 Gram
Weight		 Footnote Oversize
194964 565 4.600 4.250 6.535 9.800 1.140 15.3 14.5 13.1 13.0 611 B 0.134
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
194909 565 4.600 4.250 6.385 9.790 1.280 15.3 14.5 13.1 13.0 654 B 0.134
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


- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.

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