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SMALL BLOCK CHEVY
BIG BLOCK CHEVY
FORD
MOPAR
BUICK
NHRA
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)

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

 Tech and Installation Tips
 Valve Relief Diagram
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
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 J20008-4530-5
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
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
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
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
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
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
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

18º BIG CHIEF/BIG DUKE
Std Bore: 4.250
Ring package designed for: .043 BACKCUT, .043 D-WALL, 3.0MM Rings

 Tech and Installation Tips
 Valve Relief Diagram
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 9.780 1.060 16.8 15.8 14.2 18.0 589 B 0.134 J77008-4600-5
243314 568 4.610 4.375 6.535 9.780 1.060 16.8 15.8 14.2 18.0 577 B 0.144 J77008-4610-5
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
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

NITROUS SERIES
Std Bore: 4.250
Ring package designed for: .043 BACKCUT, 1/16, 3/16 Rings

 Tech and Installation Tips
 Valve Relief Diagram
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 J711L8-4560-5
243318 565 4.600 4.250 6.535 9.780 1.120 15.3 14.5 13.1 13.0 619 B 0.134 J711L8-4600-5
243319 568 4.610 4.250 6.535 9.780 1.120 15.4 14.6 13.2 13.0 621 B 0.144 J711L8-4610-5
243320 555 4.560 4.250 6.535 9.780 1.120 16.5 15.5 13.9 20.0 NEW! B 0.094 J711L8-4560-5
243321 565 4.600 4.250 6.535 9.780 1.120 16.7 15.7 14.1 20.0 NEW! B 0.134 J711L8-4600-5
243322 568 4.610 4.250 6.535 9.780 1.120 16.8 15.8 14.1 20.0 NEW! B 0.144 J711L8-4610-5
243323 555 4.560 4.250 6.385 9.780 1.270 15.1 14.3 12.9 13.0 NEW! B 0.094 J711L8-4560-5
243324 565 4.600 4.250 6.385 9.780 1.270 15.3 14.5 13.1 13.0 NEW! B 0.134 J711L8-4600-5
243325 568 4.610 4.250 6.385 9.780 1.270 15.4 14.6 13.2 13.0 NEW! B 0.144 J711L8-4610-5

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