GEN III/IV LS7

GM LS7 Dish Our brand new 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. (CR calculated with .040 gasket thickness and 0.00" deck clearance).

*STOCK ROD MUST BE HONED TO ACCEPT .927" DIA PIN. MILLING OF ROD BALANCE PAD MAY BE NEEDED DUE TO VARIATION FROM FACTORY.*

Includes:

  • Accumulator Grooves
  • Double Pin Oilers
  • Offset Wrist Pin

Includes:

  • Pin #927-2250-15-51C (106g)
  • 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
311924 4.130 4.000 6.077 9.240 70.0 12.5 1.163 3.00 JG31F8-4135-2 Dome JE Pistons Back Order
311907 4.130 4.000 6.125 9.240 70.0 11.7 1.115 -2.00 JG31F8-4135-2 Flat Top JE Pistons Back Order
311914 4.128 - - - - - 1.163 -30.00 JG31F8-4125-2 Inv Dome/Dish JE Pistons Back Order
311915 4.130 - - - - - 1.163 -30.00 JG31F8-4135-2 Inv Dome/Dish JE Pistons Back Order
311922 4.125 4.000 6.077 9.240 70.0 12.5 1.163 3.20 JG31F8-4125-2 Dome JE Pistons Back Order
311925 4.125 4.000 6.125 9.240 70.0 12.5 1.115 3.20 JG31F8-4125-2 Dome JE Pistons In stock
311903 4.128 4.000 6.077 9.240 70.0 11.7 1.163 -2.00 JG31F8-4125-2 Flat Top JE Pistons Back Order
311930 4.130 4.100 6.125 9.240 70.0 12.5 1.065 1.10 JG31F8-4135-2 Dome JE Pistons Back Order
311923 4.128 4.000 6.077 9.240 70.0 12.5 1.163 3.10 JG31F8-4125-2 Dome JE Pistons Back Order
311918 4.130 4.000 6.125 9.240 70.0 9.0 1.115 -30.00 JG31F8-4135-2 Inv Dome/Dish JE Pistons Back Order
311927 4.130 4.000 6.125 9.240 70.0 12.5 1.115 3.00 JG31F8-4135-2 Dome JE Pistons Back Order
311905 4.125 4.000 6.125 9.240 70.0 11.7 1.115 -2.00 JG31F8-4125-2 Flat Top JE Pistons Back Order
311919 4.125 4.100 6.125 9.240 70.0 9.0 1.065 -33.00 JG31F8-4125-2 Inv Dome/Dish JE Pistons Back Order
311926 4.128 4.000 6.125 9.240 70.0 12.5 1.115 3.10 JG31F8-4125-2 Dome JE Pistons Back Order
311921 4.130 4.100 6.125 9.240 70.0 9.0 1.065 -33.00 JG31F8-4135-2 Inv Dome/Dish JE Pistons Back Order
311917 4.128 4.000 6.125 9.240 70.0 9.0 1.115 -30.00 JG31F8-4125-2 Inv Dome/Dish JE Pistons Back Order
311910 4.128 4.100 6.125 9.240 70.0 12.0 1.065 -2.00 JG31F8-4125-2 Flat Top JE Pistons Back Order
311902 4.125 4.000 6.077 9.240 70.0 11.7 1.163 -2.00 JG31F8-4125-2 Flat Top JE Pistons In stock
311906 4.128 4.000 6.125 9.240 70.0 11.7 1.115 -2.00 JG31F8-4125-2 Flat Top JE Pistons Back Order
311929 4.128 4.100 6.125 9.240 70.0 12.5 1.065 JG31F8-4125-2 Dome JE Pistons Back Order
311920 4.128 4.100 6.125 9.240 70.0 9.0 1.065 JG31F8-4125-2 Inv Dome/Dish JE Pistons Back Order
311913 4.125 - - - - - 1.163 -30.00 JG31F8-4125-2 Inv Dome/Dish JE Pistons Back Order
311916 4.125 4.000 6.125 9.240 70.0 9.0 1.115 -30.00 JG31F8-4125-2 Inv Dome/Dish JE Pistons In stock
311911 4.130 4.100 6.125 9.240 70.0 12.0 1.065 -2.00 JG31F8-4135-2 Flat Top JE Pistons Back Order
311909 4.125 4.100 6.125 9.240 70.0 12.0 1.065 -2.00 JG31F8-4125-2 Flat Top JE Pistons Back Order
311904 4.130 4.000 6.077 9.240 70.0 11.7 1.163 -2.00 JG31F8-4135-2 Flat Top JE Pistons In stock
311928 4.125 4.100 6.125 9.240 70.0 12.5 1.065 1.30 JG31F8-4125-2 Dome JE Pistons Back Order