Gen V LT1

GM LT Asymmetrical FSR

Our Asymmetrical FSR (Forged Side Relief) forging design allows for the use of the most popular stroke and rod combinations while eliminating reluctor wheel clearance problems. Asymmetrical forging design maintains a larger skirt on the heavily stressed major thrust side, while reducing friction with a smaller skirt on the minor thrust side. The result is a high strength, lightweight piston that significantly reduces friction in your engine. Lightweight and extremely durable, these pistons are machined for 1.2mm, 1.5mm, 3.0mm rings.

Features:

  • Accumulator Grooves
  • Double Pin Oilers
  • Offset Wrist Pin

Includes:

  • Pin #927-2250 Pin for use with 6.125” Rod Length
  • Round Wire Locks # 927-073-MW

*Rings Sold Separately*

Part # Brand Bore Stroke Rod Deck Head CC Comp. Ratio Comp. Height Crown Vol. Ring Set Head Type Stock Action
338685 JE Pistons 4.065 4.000 6.125 9.240 59.0 12.3 1.115 -4.60 JG31F1-4070-0 Dome Back Order
338676 JE Pistons 4.065 3.622 6.125 9.240 59.0 10.0 1.304 -15.00 JG31F1-4070-0 Inv Dome/Dish Back Order
338687 JE Pistons 4.075 4.000 6.125 9.240 59.0 12.3 1.115 -5.00 JG31F1-4075-5 Dome Back Order
360824 JE Pistons 4.065 3.622 6.098 9.240 59.0 10.0 1.326 -13.90 JG31F1-4070-0 Inv Dome/Dish In stock
338678 JE Pistons 4.075 3.622 6.125 9.240 59.0 10.0 1.304 -15.30 JG31F1-4075-5 Inv Dome/Dish Back Order
338686 JE Pistons 4.070 4.000 6.125 9.240 59.0 12.3 1.115 -4.80 JG31F1-4070-0 Dome Back Order
360783 JE Ultra Series 4.070 3.622 6.125 9.240 59.0 10.0 1.304 -15.10 JG31F1-4070-0 Inv Dome/Dish In stock
360826 JE Pistons 4.075 3.622 6.098 9.240 59.0 10.0 1.326 -14.30 JG31F1-4075-5 Inv Dome/Dish Back Order
360825 JE Pistons 4.070 3.622 6.098 9.240 59.0 10.0 1.326 -14.10 JG31F1-4070-0 Inv Dome/Dish Back Order
338681 JE Pistons 4.075 3.622 6.125 9.240 59.0 12.3 1.304 2.20 JG31F1-4075-5 Dome Back Order
360789 JE Ultra Series 4.075 4.000 6.125 9.240 59.0 10.0 1.115 -24.50 JG31F1-4070-0 Inv Dome/Dish Back Order
338680 JE Pistons 4.070 3.622 6.125 9.240 59.0 12.3 1.304 2.30 JG31F1-4070-0 Dome Back Order
360788 JE Ultra Series 4.070 4.000 6.125 9.240 59.0 10.0 1.115 -24.20 JG31F1-4070-0 Inv Dome/Dish Back Order
360782 JE Ultra Series 4.065 3.622 6.125 9.240 59.0 10.0 1.304 -15.00 JG31F1-4070-0 Inv Dome/Dish In stock
338677 JE Pistons 4.070 3.622 6.125 9.240 59.0 10.0 1.304 -15.10 JG31F1-4070-0 Inv Dome/Dish Back Order
338684 JE Pistons 4.075 4.000 6.125 9.240 59.0 10.0 1.115 -24.30 JG31F1-4075-5 Inv Dome/Dish Back Order
338683 JE Pistons 4.070 4.000 6.125 9.240 59.0 10.0 1.115 -24.10 JG31F1-4070-0 Inv Dome/Dish Back Order
360784 JE Ultra Series 4.075 3.622 6.125 9.240 59.0 10.0 1.304 -15.30 JG31F8-4075-5 Inv Dome/Dish Back Order
338679 JE Pistons 4.065 3.622 6.125 9.240 59.0 12.3 1.304 2.50 JG31F1-4070-0 Dome Back Order
360787 JE Ultra Series 4.065 4.000 6.125 9.240 59.0 10.0 1.115 -23.90 JG31F8-4070-0 Inv Dome/Dish In stock
338682 JE Pistons 4.065 4.000 6.125 9.240 59.0 10.0 1.115 -23.70 JG31F1-4070-0 Inv Dome/Dish In stock