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
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502 SERIES
Std Bore: 4.466
Ring package designed for: .043 BACKCUT, 1/16, 3/16 Rings
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| 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 |
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 |
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| 293083 |
565 |
4.600 |
4.250 |
6.535 |
9.780 |
1.120 |
13.6 |
12.6 |
11.9 |
29.9 |
617 |
B |
0.134 |
J860L8-4600-5 |
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| 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 |
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| 258199 |
565 |
4.600 |
4.250 |
6.385 |
9.780 |
1.270 |
16.0 |
14.6 |
13.7 |
44.0 |
705 |
B |
0.134 |
J860L8-4600-5 |
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| 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 |
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| 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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| 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 |
J860F8-4625-5 |
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632 SERIES
Std Bore: 4.466
Ring package designed for: .043 BACKCUT, 1/16, 3/16 Rings
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| 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 |
J860L8-4600-5 |
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| 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 |
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| 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 |
J860F8-4625-5 |
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Tech and Installation Tips
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Valve Relief Diagram
- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.