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SMALL BLOCK CHEVY
BIG BLOCK CHEVY
FORD
MOPAR
BUICK
NHRA
B/B NITROUS SERIES DOME

These big block pistons have ring lands designed specifically for nitrous applications. Valve reliefs are designed to accept oversized valves and long duration, wide lobe separation camshafts, they are also compatible with angle milled heads. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings. Fits open chamber cylinder heads.

Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS)
Double pin oilers
Accumulator Grooves

502 SERIES
Std Bore: 4.466
Ring package designed for: 1/16, 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
110cc 118cc 124cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
258238 540 4.500 4.250 6.385 9.780 1.270 15.7 14.3 13.4 45.0 641 B 0.034 J10008-4500-5
258239 548 4.530 4.250 6.385 9.780 1.270 15.9 14.5 13.6 45.0 657 B 0.064 J10008-4530-5
258240 555 4.560 4.250 6.385 9.780 1.270 16.0 14.6 13.7 45.0 668 B 0.094 J10008-4560-5
258197 560 4.580 4.250 6.385 9.780 1.270 16.1 14.7 13.8 45.0 677 B 0.114 J100F8-4580-5
258241 565 4.600 4.250 6.385 9.780 1.270 16.3 14.8 13.9 45.0 686 B 0.134 J100U8-4600-5
258198 568 4.610 4.250 6.385 9.780 1.270 16.4 14.9 14.0 45.0 693 B 0.144 J100H8-4610-5

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