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Chevy Big Block Open Chamber Hollow Dome Pistons 13 to 1 High Compression Ratio Includes: Pistons, Pins, Spiro Lox ROSS high compression ratio Big Block pistons listed in this section feature special hollow dome forgings for maximum strength with minimum weight. Will work with open chamber heads. Suitable for nitrous systems of 250 HP 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 in rods. Compression ratio is based on .050 piston to head clearance (with deck and gasket). Ring grooves are 1/16, 1/16, 3/16. Comp Ratio base on: .050 piston to head clearance (deck & gasket) Block Height: 9.800 Forced Induction: No Nitrous: Yes - Up to 250 HP Pins: .990 dia. x 2.930 length x .150 wall Ring Grooves: 1/16, 1/16, 3/16

Bore Stroke Rod Lgth Dome CC Comp Ratio w/Head CC of: Dome Height C.H.  Gram Weight Part # Price Notes 109 118 124 4.280  4.000 6.135  51.0  14.5 13.0 12.1 0.700  1.648  631  83062 $659 - 4.280  4.000 6.385  51.0 14.5 13.0 12.1 0.700  1.398  595  83032 $659 - 4.280  4.000  6.535  51.0  14.5 13.0 12.1 0.700  1.245  561  99549 $709 1 4.280  4.250  6.135  51.0  15.4 13.7 12.8 0.700  1.523  593  83462 $659 - 4.280  4.250  6.385  51.0  15.4 13.7 12.8 0.700  1.273  566  83432 $709 1 4.280  4.250  6.535  51.0  15.4 13.7 12.8 0.700  1.120  529  99546 $709 1 4.310  4.000  6.135  51.0  14.7 13.1 12.3 0.700  1.635  647  80001 $659 - 4.280  4.000 6.135  51.0  14.7 13.1 12.3 0.700  1.648  653  86062 $659 - 4.310  4.000  6.385  51.0  14.7 13.1 12.3 0.700  1.398  602  86032 $659 - 4.310  4.000  6.535  51.0  14.7 13.1 12.3 0.700  1.245  559  99550 $709 1 4.310  4.250  6.135  50.0  15.3 13.7 12.8 0.640  1.523  611  86462 $659 - 4.310  4.250  6.385  51.0  15.3 13.7 12.8 0.640  1.273  565  99510 $709 1 4.310  4.250  6.385  51.0  15.5 13.9 13.0 0.700  1.273  577  86432 $709 1 4.310  4.250  6.535  51.0  15.5 13.9 13.0 0.700  1.120  531  99547 $709 1 4.320  3.760  6.135  51.0  13.9 12.4 11.6 0.700  1.768  664  99554 $659 - 4.320  4.000  6.535  51.0  14.7 13.2 12.3 0.700  1.245  561  99551 $709 1 4.320  4.250  6.535  51.0  15.6 13.9 13.0 0.700  1.120  534  99548 $709 1 4.350  3.760  6.135  51.0  14.0 12.6 11.8 0.700  1.768  674  99555 $659 - 4.350  4.000  6.135  51.0  14.9 13.3 12.4 0.700  1.648  665  87062 $659 - 4.350  4.000 6.385  51.0  14.9 13.3 12.4 0.700  1.398  611  87432 $659 - 4.350  4.000 6.535  51.0  14.9 13.3 12.4 0.700  1.245  571  99552 $709 1 4.350  4.250  6.385  51.0  15.7 14.1 13.2 0.700  1.273  595  99509 $709 1 4.350  4.250  6.535  51.0  15.7 14.1 13.2 0.700  1.120  545  99553 $709 1 4.375  4.000  6.135  51.0  15.0 13.4 12.6 0.700  1.648  641  99611 $659 - 4.375  4.000  6.135  51.0  15.0 13.4 12.6 0.700  1.648  639  88062 $659 - 4.375  4.000  6.385  51.0  15.0 13.4 12.6 0.700  1.398  621  88032 $659 - 4.375  4.000  6.385  51.0  15.0 13.4 12.6 0.700  1.398  604  99623 $659 - 4.375  4.250  6.135  49.0  15.5 13.9 13.0 0.600  1.523  609  99622 $659 - 4.375  4.250  6.385  49.0  15.5 13.9 13.0 0.600  1.273  563  99624 $709 1 4.500  4.000  6.135  51.0  15.7 14.0 13.1 0.700  1.648  643  85062 $659 - 4.500  4.000  6.385  51.0  15.7 14.0 13.1 0.700  1.398  620  85032 $659 - 4.500  4.250  6.135  49.0  16.2 14.5 13.6 0.600  1.523  628  85462 $659 - 4.500  4.250  6.385  45.0  15.4 13.9 13.0 0.500  1.273  558  99512 $659 - 4.500  4.250  6.385  49.0  16.2 14.5 13.6 0.600  1.273  589  85432 $709 1 4.530  4.000  6.135  51.0  15.8 14.2 13.3 0.700  1.648  670  82014 $659 - 4.530  4.000  6.385  46.5 15.0 13.5 12.6 0.700  1.398  642  82015 $659 - 4.530  4.250  6.385  45.0  15.5 14.0 13.2 0.500  1.273  565  99513 $659 - 4.560  4.000  6.385  49.0  15.6 14.0 13.1 0.700  1.398  631  88766 $659 - 4.560  4.000  6.535  45.0  14.8 13.4 12.6 0.500  1.245  594  99776 $709 1 4.560  4.250  6.385  45.0  15.7 14.2 13.3 0.500  1.273  572  99514 $659 - 4.560  4.250  6.385  49.0  16.5 14.8 13.9 0.600  1.273  592  88765 $709 1 4.560  4.250  6.535  40.5 14.9 13.5 12.7 0.500  1.120  552  99775 $709 1 4.600  4.000  6.535  45.0  15.0 13.6 12.8 0.500  1.245  607  99778 $709 1 4.600  4.250  6.535  45.0  15.9 14.4 13.5 0.500  1.120  594  99777 $709 1 4.625  4.000  6.535  45.0  15.2 13.7 12.9 0.500  1.245  618  99779 $709 1 4.625  4.250  6.535  45.0  16.0 14.5 13.6 0.500  1.120  592  99781 $709 1 Notes: Price includes Oil Ring Support Rails

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