NITROUS SERIES DOME
The ring lands, crown, and bottom band of these pistons are specifically designed for nitrous applications. The valve reliefs accommodate most oversized valves and long duration, wide lobe separation cams. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings. HNS (Hardened Nitrous Series) rings are available for this series, change ring prefix to J820F8.
Includes:
Pin #927-2950-15-51S (140g)
Contact reduction grooves
Double spiro locks #927-042-CS
Double pin oilers
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350 Series
Std Bore: 4.000
Ring package designed for: 1/16, 1/16, 3/16 Rings
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400 Series
Std Bore: 4.125
Ring package designed for: 1/16, 1/16, 3/16 Rings
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| Part # |
CID |
Bore |
Stroke |
Rod
Lgth. |
Block
Ht. |
Comp.
Ht. |
| Head Cubic Centimeters |
| 58cc |
64cc |
76cc |
| Compression Ratio |
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Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
 |
| 232508 |
400 |
4.125 |
3.750 |
6.000 |
9.020 |
1.145 |
13.9 |
12.8 |
11.1 |
3.0 |
524 |
B,S |
STD |
J100F8-4125-5 |
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| 173586 |
407 |
4.155 |
3.750 |
6.000 |
9.000 |
1.125 |
13.9 |
12.8 |
11.1 |
3.0 |
529 |
B,S |
0.030 |
J10008-4155-5 |
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| 194952 |
409 |
4.165 |
3.750 |
6.000 |
9.000 |
1.125 |
14.0 |
12.8 |
11.0 |
3.0 |
530 |
B,S |
0.040 |
J10008-4165-5 |
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| 173588 |
380 |
4.155 |
3.500 |
6.000 |
9.000 |
1.250 |
14.0 |
12.8 |
11.0 |
8.0 |
544 |
A,B |
0.030 |
J10008-4155-5 |
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| 194886 |
381 |
4.165 |
3.500 |
6.000 |
9.000 |
1.250 |
14.0 |
12.8 |
11.0 |
8.0 |
551 |
A,B |
0.040 |
J10008-4165-5 |
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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.