Pro Mod Style Gas-Ported (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
Part # Brand Bore Stroke Rod Deck Head CC Comp. Ratio Comp. Height Crown Vol. Ring Set Head Type Stock Action
194964 JE Pistons 4.600 4.250 6.535 9.800 82.0 15.3 1.140 13cc JG86F8-4600-5 Dome Back Order
194964 JE Pistons 4.600 4.250 6.535 9.800 87.0 14.5 1.140 13cc JG86F8-4600-5 Dome Back Order
194964 JE Pistons 4.600 4.250 6.535 9.800 97.0 13.1 1.140 13cc JG86F8-4600-5 Dome Back Order
194910 JE Pistons 4.610 4.250 6.385 9.800 82.0 15.4 1.280 13.00 JG86H8-4610-5 Dome Back Order
194910 JE Pistons 4.610 4.250 6.385 9.800 87.0 14.6 1.280 13.00 JG86H8-4610-5 Dome Back Order
194910 JE Pistons 4.610 4.250 6.385 9.800 97.0 13.2 1.280 13.00 JG86H8-4610-5 Dome Back Order
194909 JE Pistons 4.600 4.250 6.385 9.800 82.0 15.3 1.280 13.00 JG86F8-4600-5 Dome Back Order
194909 JE Pistons 4.600 4.250 6.385 9.800 97.0 13.1 1.280 13.00 JG86F8-4600-5 Dome Back Order
194909 JE Pistons 4.600 4.250 6.385 9.800 87.0 14.5 1.280 13.00 JG86F8-4600-5 Dome Back Order