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PRO MOD STYLE GP 18º

Designed for Pro Mod style engines, these pistons are specifically designed for nitrous applications. The precision CNC machined rings grooves are designed for .043 back cut, 1/16, 3/16 rings. Compression heights figured at zero deck clearance with listed block height. These pistons will only fit Big Chief cylinder heads.

Includes:
Pin #990-2930-18-51S (174g)
Double spiro locks (#990-042-CS)
Vertical and lateral gas ports for maximum top ring seal
18º PRO MOD STYLE
Std Bore: 4.250 (427/454), 4.466 (502) 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
194964 565 4.600 4.250 6.535 9.800 1.140 15.3 14.5 13.1 13.0 611 B 0.134 JG86L8-4600-5
194909 565 4.600 4.250 6.385 9.790 1.280 15.3 14.5 13.1 13.0 654 B,M 0.134 JG86L8-4600-5
194910 568 4.610 4.250 6.385 9.790 1.280 15.4 14.6 13.2 13.0 665 B,M 0.144 J860H8-4610-5

- 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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