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Comp Ratio base on: .050 piston to head clearance (deck & gasket) Block Height: 9.800 Forced Induction: Yes - up to 5psi Nitrous: Yes - Up to 300 HP Pins: .990 dia. x 2.930 lgth x .150 wall Ring Grooves: 1/16, 1/16, 3/16 Chevy Big Block Low Dome, Open Chamber 9 to 1 Comp Ratio Includes: Pistons, Pins, Spiro Lox ROSS low dome Big Block pistons listed in this section feature special forgings for maximum strength. Will also work with open chamber heads. Suitable for nitrous systems of 300 horsepower or less. Pins included are .990 dia., 2.930 length, .150 wall, 149 gram weight, aircraft quality, and are retained by double spiro lox or can be press fitted into rods. Compression ratio based on .050 piston to head clearance (deck and gasket combined). Ring grooves are 1/16, 1/16, 3/16.

Bore Stroke Rod Length Comp Ratio w/Head CC of: C.H.  Weight Part # Price 109 118 124 4.280  4.000  6.135  10.4 9.6 9.1 1.648  688  83069 $649 4.310  4.000  6.135  10.5 9.7 9.2 1.648  718  88767 $649

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