BIG DUKE / BIG CHIEF / BIG VICTOR GP 18°
These pistons are specifically designed for Big Duke/Big Chief cylinder heads and feature our race proven dome and skirt design. Valve reliefs are designed to accept oversized valves and long duration, tight lobe separation roller cams. Precision CNC machined ring grooves accept .043 D-wall, 1/16, 3/16 rings.
Includes:
Pin #990-2930-15-51S (150g)
Forced pin oiler, with annular oil reservoir |
Nitrous Series Includes:
Vertical gas ports
Double spiro locks (#990-042-CS) |
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18º BIG CHIEF / BIG DUKE / BIG VICTOR
Std Bore: 4.250 (427/454), 4.466 (502)
Ring package designed for: .043 D-WALL, 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 |
|
Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
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| 170671 |
548 |
4.530 |
4.250 |
6.385 |
9.780 |
1.270 |
15.1 |
14.2 |
12.9 |
13.0 |
593 |
B,L |
0.064 |
J20008-4530-5 |
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| 170672 |
555 |
4.560 |
4.250 |
6.385 |
9.780 |
1.270 |
15.1 |
14.3 |
12.9 |
13.0 |
625 |
B |
0.094 |
J20008-4560-5 |
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| 170668 |
555 |
4.560 |
4.250 |
6.535 |
9.780 |
1.120 |
15.1 |
14.3 |
12.9 |
13.0 |
569 |
B |
0.094 |
J20008-4560-5 |
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| 218588 |
555 |
4.560 |
4.250 |
6.535 |
9.780 |
1.120 |
16.5 |
15.5 |
13.9 |
20.0 |
581 |
B |
0.094 |
J20008-4560-5 |
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| 170673 |
565 |
4.600 |
4.250 |
6.385 |
9.780 |
1.270 |
15.3 |
14.5 |
13.1 |
13.0 |
641 |
B |
0.134 |
J200U8-4600-5 |
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| 170669 |
565 |
4.600 |
4.250 |
6.535 |
9.780 |
1.120 |
15.3 |
14.5 |
13.1 |
13.0 |
582 |
B,L |
0.134 |
J200U8-4600-5 |
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| 218585 |
565 |
4.600 |
4.250 |
6.535 |
9.780 |
1.120 |
16.7 |
15.7 |
14.1 |
20.0 |
593 |
B |
0.134 |
J200U8-4600-5 |
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18º BIG CHIEF / BIG DUKE / BIG VICTOR
Std Bore: 4.250
Ring package designed for: .043 BACKCUT, .043 D-WALL, 3.0MM Rings
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| Part # |
CID |
Bore |
Stroke |
Rod
Lgth. |
Block
Ht. |
Comp.
Ht. |
| Head Cubic Centimeters |
| 82cc |
87cc |
97cc |
| Compression Ratio |
|
Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
|
| 243313 |
565 |
4.600 |
4.375 |
6.535 |
9.783 |
1.060 |
16.8 |
15.8 |
14.2 |
18.0 |
589 |
B |
0.134 |
J77008-4600-5 |
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| 243314 |
568 |
4.610 |
4.375 |
6.535 |
9.783 |
1.060 |
16.8 |
15.8 |
14.2 |
18.0 |
577 |
B |
0.144 |
J77008-4610-5 |
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| 243315 |
565 |
4.600 |
4.250 |
6.535 |
9.780 |
1.120 |
16.7 |
15.7 |
14.1 |
20.0 |
602 |
B |
0.134 |
J77008-4600-5 |
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| 243316 |
568 |
4.610 |
4.250 |
6.535 |
9.780 |
1.120 |
16.8 |
15.8 |
14.1 |
20.0 |
616 |
B |
0.144 |
J77008-4610-5 |
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NITROUS SERIES
Std Bore: 4.250
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 |
|
Dome
Vol. |
Gram
Wt. |
Footnote |
Oversize |
Recom.
Ring Set |
|
| 243317 |
555 |
4.560 |
4.250 |
6.535 |
9.780 |
1.120 |
15.1 |
14.3 |
12.9 |
13.0 |
NEW! |
B |
0.094 |
J86008-4560-5 |
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| 243323 |
555 |
4.560 |
4.250 |
6.385 |
9.780 |
1.270 |
15.1 |
14.3 |
12.9 |
13.0 |
640 |
B |
0.094 |
J86008-4560-5 |
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| 243320 |
555 |
4.560 |
4.250 |
6.535 |
9.780 |
1.120 |
16.5 |
15.5 |
13.9 |
20.0 |
610 |
B |
0.094 |
J86008-4560-5 |
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| 243324 |
565 |
4.600 |
4.250 |
6.385 |
9.780 |
1.270 |
15.3 |
14.5 |
13.1 |
13.0 |
654 |
B |
0.134 |
J860L8-4600-5 |
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| 243318 |
565 |
4.600 |
4.250 |
6.535 |
9.780 |
1.120 |
15.3 |
14.5 |
13.1 |
13.0 |
619 |
B |
0.134 |
J860L8-4600-5 |
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| 243321 |
565 |
4.600 |
4.250 |
6.535 |
9.780 |
1.120 |
16.7 |
15.7 |
14.1 |
20.0 |
638 |
B |
0.134 |
J860L8-4600-5 |
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| 243325 |
568 |
4.610 |
4.250 |
6.385 |
9.780 |
1.270 |
15.4 |
14.6 |
13.2 |
13.0 |
659! |
B |
0.144 |
J860L8-4610-5 |
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| 243319 |
568 |
4.610 |
4.250 |
6.535 |
9.780 |
1.120 |
15.4 |
14.6 |
13.2 |
13.0 |
621 |
B |
0.144 |
J860L8-4610-5 |
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| 243322 |
568 |
4.610 |
4.250 |
6.535 |
9.780 |
1.120 |
16.8 |
15.8 |
14.1 |
20.0 |
629 |
B |
0.144 |
J860L8-4610-5 |
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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.