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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)
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

Click here to see matching JE Pro Seal Head Gaskets!

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
170668 621 4.560 4.750 6.700 10.195 1.120 16.8 15.9 14.3 13.0 584 B,M 0.094 J20008-4560-5
170669 632 4.600 4.750 6.700 10.195 1.120 17.0 16.1 14.5 13.0 598 B 0.134 J200U8-4600-5
218585 632 4.600 4.750 6.700 10.195 1.120 18.6 17.5 15.6 20.0 605 B 0.134 J200U8-4600-5
170668 555 4.560 4.250 6.535 9.780 1.120 15.1 14.3 12.9 13.0 569 B,M 0.094 J20008-4560-5
170672 555 4.560 4.250 6.385 9.780 1.270 15.1 14.3 12.9 13.0 625 B,M 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
170669 565 4.600 4.250 6.535 9.780 1.120 15.3 14.5 13.1 13.0 582 B 0.134 J200U8-4600-5
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


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

Click here to see matching JE Pro Seal Head Gaskets!

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
243315 632 4.600 4.750 6.700 10.195 1.120 18.6 17.5 15.6 20.0 602 B 0.134 JG7708-4600-5
243316 634 4.610 4.750 6.700 10.195 1.120 18.7 17.6 15.7 20.0 617 B 0.144 JG7708-4610-5
243313 565 4.600 4.375 6.535 9.783 1.060 16.8 15.8 14.2 18.0 589 B,M 0.134 JG7708-4600-5
243314 568 4.610 4.375 6.535 9.783 1.060 16.8 15.8 14.2 18.0 577 B 0.144 JG7708-4610-5
243315 565 4.600 4.250 6.535 9.780 1.120 16.7 15.7 14.1 20.0 602 B,M 0.134 JG7708-4600-5
243316 568 4.610 4.250 6.535 9.780 1.120 16.8 15.8 14.1 20.0 616 B 0.144 JG7708-4610-5


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

Click here to see matching JE Pro Seal Head Gaskets!

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 621 4.560 4.750 6.700 10.195 1.120 16.7 15.9 14.3 13.0 580 B,M 0.094 J86008-4560-5
243318 632 4.600 4.750 6.700 10.195 1.120 17.0 16.1 14.5 13.0 619 B 0.134 JG86L8-4600-5
243321 632 4.600 4.750 6.700 10.195 1.120 18.6 17.5 15.6 20.0 632 B 0.134 JG86L8-4600-5
243319 634 4.610 4.750 6.700 10.195 1.120 17.1 16.2 14.6 13.0 621 B 0.144 J860L8-4610-5
243322 634 4.610 4.750 6.700 10.195 1.120 18.7 17.6 15.7 20.0 627 B,M 0.144 J860L8-4610-5
243317 555 4.560 4.250 6.535 9.780 1.120 15.1 14.3 12.9 13.0 NEW! B,M 0.094 J86008-4560-5
243323 555 4.560 4.250 6.385 9.780 1.270 15.1 14.3 12.9 13.0 640 B,M 0.094 J86008-4560-5
243320 555 4.560 4.250 6.535 9.780 1.120 16.5 15.5 13.9 20.0 610 B 0.094 J860008-4560-5
243318 565 4.600 4.250 6.535 9.780 1.120 15.3 14.5 13.1 13.0 619 B 0.134 JG86L8-4600-5
243324 565 4.600 4.250 6.385 9.780 1.270 15.3 14.5 13.1 13.0 654 B,M 0.134 JG86L8-4600-5
243321 565 4.600 4.250 6.535 9.780 1.120 16.7 15.7 14.1 20.0 638 B 0.134 JG86L8-4600-5
243319 568 4.610 4.250 6.535 9.780 1.120 15.4 14.6 13.2 13.0 621 B 0.144 J860L8-4610-5
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
243322 568 4.610 4.250 6.535 9.780 1.120 16.8 15.8 14.1 20.0 629 B,M 0.144 J860L8-4610-5

- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.


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