| BIG DUKE / BIG CHIEF GP 18º
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
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 # |
Cubic
Inches |
Bore |
Stroke |
Rod
Length |
Block
Height |
Compression
Distance |
 |
| Head Cubic Centimeters |
| 82cc |
87cc |
97cc |
| Compression Ratio |
|
|
Dome
Volume |
Gram
Weight |
Footnote |
Oversize |
|
| 170667 |
548 |
4.530 |
4.250 |
6.535 |
9.780 |
1.120 |
15.1 |
|
14.2 |
|
12.9 |
13.0 |
557 |
B,L |
0.064 |
|
| 170668 |
555 |
4.560 |
4.250 |
6.535 |
9.780 |
1.120 |
15.1 |
14.3 |
12.9 |
13.0 |
569 |
B |
0.094 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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18º BIG CHIEF/BIG DUKE
Std Bore: 4.250
Ring package designed for: .043 BACKCUT, .043 D-WALL, 3.0MM Rings |
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| Part # |
Cubic
Inches |
Bore |
Stroke |
Rod
Length |
Block
Height |
Compression
Distance |
|
| Head Cubic Centimeters |
| 82cc |
87cc |
97cc |
| Compression Ratio |
|
|
Dome
Volume |
Gram
Weight |
Footnote |
Oversize |
|
| 243313 |
565 |
4.600 |
4.375 |
6.535 |
9.780 |
1.060 |
16.8 |
|
15.8 |
|
14.2 |
18.0 |
589 |
B |
0.134 |
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| 243314 |
568 |
4.610 |
4.375 |
6.535 |
9.780 |
1.060 |
16.8 |
15.8 |
14.2 |
18.0 |
577 |
B |
0.144 |
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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 |
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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 |
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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 # |
Cubic
Inches |
Bore |
Stroke |
Rod
Length |
Block
Height |
Compression
Distance |
|
| Head Cubic Centimeters |
| 82cc |
87cc |
97cc |
| Compression Ratio |
|
|
Dome
Volume |
Gram
Weight |
Footnote |
Oversize |
|
| 243317 |
555 |
4.560 |
4.250 |
6.535 |
9.780 |
1.120 |
15.1 |
|
14.3 |
|
12.9 |
13.0 |
NEW! |
B |
0.094 |
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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 |
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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 |
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| 243320 |
555 |
4.560 |
4.250 |
6.535 |
9.780 |
1.120 |
16.5 |
15.5 |
13.9 |
20.0 |
NEW! |
B |
0.094 |
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| 243321 |
565 |
4.600 |
4.250 |
6.535 |
9.780 |
1.120 |
16.7 |
15.7 |
14.1 |
20.0 |
NEW! |
B |
0.134 |
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| 243322 |
568 |
4.610 |
4.250 |
6.535 |
9.780 |
1.120 |
16.8 |
15.8 |
14.1 |
20.0 |
NEW! |
B |
0.144 |
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| 243323 |
555 |
4.560 |
4.250 |
6.385 |
9.780 |
1.270 |
15.1 |
14.3 |
12.9 |
13.0 |
NEW! |
B |
0.094 |
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| 243324 |
565 |
4.600 |
4.250 |
6.385 |
9.780 |
1.270 |
15.3 |
14.5 |
13.1 |
13.0 |
NEW! |
B |
0.134 |
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| 243325 |
568 |
4.610 |
4.250 |
6.385 |
9.780 |
1.270 |
15.4 |
14.6 |
13.2 |
13.0 |
NEW! |
B |
0.144 |
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- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.
Tech and Installation Tips
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Valve Relief Diagram