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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

Click here to see matching JE Pro Seal Head Gaskets!

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
258200 577 4.580 4.375 6.700 10.177 1.290 16.3 14.8 13.9 44.0 700 B 0.114 J860F8-4580-5
258201 582 4.600 4.375 6.700 10.177 1.290 16.3 14.9 14.0 44.0 710 B 0.134 JG86L8-4600-5
258202 584 4.610 4.375 6.700 10.177 1.290 16.4 15.0 14.0 44.0 715 B 0.144 J860H8-4610-5
258200 560 4.580 4.250 6.385 9.800 1.290 15.9 14.5 13.6 44.0 711 B,M 0.114 J860F8-4580-5
293083 565 4.600 4.250 6.535 9.780 1.120 13.6 12.6 11.9 29.9 617 B 0.134 JG86L8-4600-5
258201 565 4.600 4.250 6.385 9.800 1.290 16.0 14.6 13.7 44.0 708 B 0.134 JG86L8-4600-5
258199 565 4.600 4.250 6.385 9.780 1.270 16.0 14.6 13.7 44.0 705 B 0.134 JG86L8-4600-5
293084 568 4.610 4.250 6.535 9.780 1.120 13.6 12.6 11.9 29.5 619 B,M 0.144 J860L8-4610-5
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
293085 571 4.625 4.250 6.535 9.780 1.120 13.6 12.6 11.9 28.9 623 B,M 0.159 J860L8-4625-5


502 Head Hunter Series
Std Bore: 4.466
Ring package designed for: .043 BACKCUT, 1/16, 3/16 Rings
Designed for use with Brodix Head Hunter Series Cylinder Heads
Fits 2.400" Diameter Intake Valves

Click here to see matching JE Pro Seal Head Gaskets!
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
312689 577 4.580 4.375 6.700 10.177 1.290 16.2 14.8 13.9 44 NEW B,M .114 J860F8-4580-5
312690 582 4.600 4.375 6.700 10.177 1.290 16.3 14.9 14.0 44 NEW B,M .134 JG86L8-4600-5
312691 584 4.610 4.375 6.700 10.177 1.290 16.4 15.0 14.0 44 NEW B,M .144 JG86H8-4610-5
312692 588 4.625 4.375 6.700 10.177 1.290 16.4 15.0 14.0 44 NEW B,M .159 JG86F8-4625-5
312689 560 4.580 4.250 6.385 9.800 1.290 15.9 14.5 13.6 44 NEW B,M .114 J860F8-4580-5
312685 565 4.600 4.250 6.535 9.780 1.120 13.6 12.6 11.9 29.9 NEW B,M .134 JG86L8-4600-5
312690 565 4.600 4.250 6.385 9.800 1.290 16.0 14.6 13.7 44 NEW B,M .134 JG86L8-4600-5
312688 565 4.600 4.250 6.385 9.780 1.270 16.0 14.6 13.7 44 NEW B,M .134 JG86L8-4600-5
312686 568 4.610 4.250 6.535 9.780 1.120 13.6 12.6 11.9 29.5 NEW B,M .144 JG86L8-4610-5
312691 568 4.610 4.250 6.385 9.800 1.290 16.1 14.7 13.8 44 NEW B,M .144 JG86H8-4610-5
312687 571 4.625 4.250 6.535 9.780 1.120 13.6 12.6 11.9 28.9 NEW B,M .159 JG86F8-4625-5
312692 571 4.625 4.250 6.385 9.800 1.290 16.1 14.7 13.8 44 NEW B,M .159 JG86F8-4625-5


632 Head Hunter Cylinder Head Series
Std Bore: 4.466
Ring package designed for: .043 BACKCUT, 1/16, 3/16 Rings
Designed for use with Brodix Head Hunger Series Cylinder Heads
Fits 2.400" Diameter Intake Valves

Click here to see matching JE Pro Seal Head Gaskets!
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
312685 632 4.600 4.750 6.700 10.195 1.120 15.1 14.0 13.2 29.9 NEW B,M .134 JG86L8-4600-5
312686 634 4.610 4.750 6.700 10.195 1.120 15.1 14.0 13.2 29.5 NEW B,M .144 JG86L8-4610-5
312687 638 4.625 4.750 6.700 10.195 1.120 15.1 14.0 13.2 28.9 NEW B,M .159 JG86F8-4625-5


632 SERIES
Std Bore: 4.466
Ring package designed for: .043 BACKCUT, 1/16, 3/16 Rings

Click here to see matching JE Pro Seal Head Gaskets!
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
293083 632 4.600 4.750 6.700 10.195 1.120 15.1 14.0 13.2 29.9 617 B 0.134 JG86L8-4600-5
293084 634 4.610 4.750 6.700 10.195 1.120 15.1 14.0 13.2 29.5 619 B,M 0.144 J860L8-4610-5
293085 638 4.625 4.750 6.700 10.195 1.120 15.1 14.0 13.2 28.9 623 B,M 0.129 J860L8-4625-5

- 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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