B/B NITROUS SERIES DOME
These big block pistons have ring lands designed specifically for nitrous applications. Valve reliefs are designed to accept oversized valves and long duration, wide lobe separation camshafts, they are also compatible with angle milled heads. Precision CNC machined ring grooves accept 1/16, 1/16, 3/16 rings. Fits open chamber cylinder heads.
Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS)
Double pin oilers
Accumulator Grooves
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502 SERIES
Std Bore: 4.466
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 |
| 110cc |
118cc |
124cc |
| Compression Ratio |
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Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
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| 258238 |
540 |
4.500 |
4.250 |
6.385 |
9.780 |
1.270 |
15.7 |
14.3 |
13.4 |
45.0 |
641 |
B |
0.034 |
J10008-4500-5 |
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| 258239 |
548 |
4.530 |
4.250 |
6.385 |
9.780 |
1.270 |
15.9 |
14.5 |
13.6 |
45.0 |
657 |
B |
0.064 |
J10008-4530-5 |
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| 258240 |
555 |
4.560 |
4.250 |
6.385 |
9.780 |
1.270 |
16.0 |
14.6 |
13.7 |
45.0 |
668 |
B |
0.094 |
J10008-4560-5 |
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| 258197 |
560 |
4.580 |
4.250 |
6.385 |
9.780 |
1.270 |
16.1 |
14.7 |
13.8 |
45.0 |
677 |
B,M |
0.114 |
J100F8-4580-5 |
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| 258241 |
565 |
4.600 |
4.250 |
6.385 |
9.780 |
1.270 |
16.3 |
14.8 |
13.9 |
45.0 |
686 |
B |
0.134 |
J100U8-4600-5 |
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| 258198 |
568 |
4.610 |
4.250 |
6.385 |
9.780 |
1.270 |
16.4 |
14.9 |
14.0 |
45.0 |
693 |
B |
0.144 |
J100H8-4610-5 |
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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.