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SMALL BLOCK CHEVY
BIG BLOCK CHEVY
FORD
MOPAR
BUICK
NHRA
NITROUS SERIES GP (GAS PORTED)

These Nitrous Series pistons are similar to the above series, vertical and lateral gas ports have been incorporated to optimize top ring seal and reduce friction. Ring grooves are machined to accept our series J860 "HNS" Hardened Nitrous Series rings with .043 back-cut top ring, 1/16 taper face second ring and 3/16 oil ring. Compression height figured using 9.800" deck height with zero deck clearance. Fits most open chamber cylinder heads. Part Number 258199 is designed for a decked block.

Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS)
Vertical and Lateral gas ports
Contact reduction grooves

502 SERIES
Std Bore: 4.466
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
110cc 118cc 124cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
258199 565 4.600 4.250 6.385 9.800 1.270 16.0 14.6 13.7 44.0 705 B 0.134 J860L8-4600-5
258200 560 4.580 4.250 6.385 9.800 1.290 15.9 14.5 13.6 44.0 711 B 0.114 J860F8-4580-5
258201 565 4.600 4.250 6.385 9.800 1.290 16.0 14.6 13.7 44.0 708 B 0.134 J860L8-4600-5
258202 568 4.610 4.250 6.385 9.800 1.290 16.1 14.7 13.8 44.0 717 B 0.144 J860H8-4610-5

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