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