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 # Cubic
Inches		 Bore Stroke Rod
Length		 Block
Height		 Compression
Distance
Head Cubic Centimeters
110cc 118cc 124cc
Compression Ratio
Dome
Volume		 Gram
Weight		 Footnote Oversize
258199 565 4.600 4.250 6.385 9.800 1.270 16.0 14.6 13.7 44.0 705 B 0.134
258200 560 4.580 4.250 6.385 9.800 1.290 15.9 14.5 13.6 44.0 711 B 0.114
258201 565 4.600 4.250 6.385 9.800 1.290 16.0 14.6 13.7 44.0 708 B 0.134
258202 568 4.610 4.250 6.385 9.800 1.290 16.1 14.7 13.8 44.0 717 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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