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