PRO MOD STYLE GP 18º
Designed for Pro Mod style engines, these pistons are specifically designed for nitrous applications. The precision CNC machined rings grooves are designed for .043 back cut, 1/16, 3/16 rings. Compression heights figured at zero deck clearance with listed block height. These pistons will only fit Big Chief cylinder heads.
Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS)
Vertical and lateral gas ports for maximum top ring seal
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18º PRO MOD STYLE
Std Bore: 4.250 (427/454), 4.466 (502)
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 |
| 82cc |
87cc |
97cc |
| Compression Ratio |
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Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
 |
| 194908 |
560 |
4.580 |
4.250 |
6.385 |
9.790 |
1.280 |
15.2 |
14.4 |
13.0 |
13.0 |
648 |
M,B |
0.114 |
J860F8-4580-5 |
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| 194909 |
565 |
4.600 |
4.250 |
6.385 |
9.790 |
1.280 |
15.3 |
14.5 |
13.1 |
13.0 |
654 |
B |
0.134 |
J860L8-4600-5 |
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| 194964 |
565 |
4.600 |
4.250 |
6.535 |
9.800 |
1.140 |
15.3 |
14.5 |
13.1 |
13.0 |
611 |
B |
0.134 |
J860L8-4600-5 |
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| 194910 |
568 |
4.610 |
4.250 |
6.385 |
9.790 |
1.280 |
15.4 |
14.6 |
13.2 |
13.0 |
665 |
M,B |
0.144 |
J860H8-4610-5 |
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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.