GEN III/IV LS1

JE Pistons has redesigned and expanded the GM LS1 series product lines! These new pistons utilized our dedicated Forged Side Relief (FSR) forging that was specifically designed for the demands of the GM LS1 series of engines. In addition we have found ways to reduce weight and maintain the durability needed for both street and racing use. (CR calculated with .051" gasket thickness and +.009-.011" deck clearance). Lightweight and extremely durable, these pistons are machined for 1.5mm, 1.5mm, 3.0mm rings.

Includes:

  • 927-2250 wrist pins included, note C
  • 945-2250 wrist pins included, note K
  • Wire locks included, #945-073-MW
Part # Bore Stroke Rod Deck Head CC Comp. Ratio Comp. Height Crown Vol. Ring Set Head Type Series Stock Action
321243 3.898 3.622 6.125 9.240 72.0 9.6 1.315 -2.00 JG6008-3905 Flat Top JE Pistons In stock
321243 3.898 3.622 6.125 9.240 66.0 10.2 1.315 -2.00 JG6008-3905 Flat Top JE Pistons In stock
321243 3.898 3.622 6.125 9.240 64.0 10.5 1.315 -2.00 JG6008-3905 Flat Top JE Pistons In stock
321245 3.898 3.900 6.125 9.240 64.0 11.2 1.175 JG6008-3905 Flat Top JE Pistons Back Order
321245 3.898 3.900 6.125 9.240 72.0 10.2 1.175 JG6008-3905 Flat Top JE Pistons Back Order
321245 3.898 3.900 6.125 9.240 66.0 10.9 1.175 JG6008-3905 Flat Top JE Pistons Back Order
326374 3.898 4.000 6.125 9.240 72.0 8.1 1.115 -29.90 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
326374 3.898 4.000 6.125 9.240 66.0 8.5 1.115 -29.90 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
326374 3.898 4.000 6.125 9.240 64.0 8.6 1.115 -29.90 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
194884 3.905 - - - - - 1.340 -2.00 JG6008-3905 Flat Top JE Pistons In stock
321244 3.905 3.622 6.125 9.240 72.0 9.6 1.315 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321244 3.905 3.622 6.125 9.240 64.0 10.5 1.315 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321244 3.905 3.622 6.125 9.240 66.0 10.3 1.315 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321241 3.898 3.622 6.125 9.240 66.0 8.5 1.315 -19.90 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321241 3.898 3.622 6.125 9.240 72.0 8.0 1.315 -19.90 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321241 3.898 3.622 6.125 9.240 64.0 8.7 1.315 -19.90 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
326375 3.905 4.000 6.125 9.240 66.0 8.5 1.115 -2.00 - Inv Dome/Dish JE Pistons Back Order
326375 3.905 4.000 6.125 9.240 72.0 8.1 1.115 -2.00 - Inv Dome/Dish JE Pistons Back Order
326375 3.905 4.000 6.125 9.240 64.0 8.6 1.115 -2.00 - Inv Dome/Dish JE Pistons Back Order
321242 3.905 3.622 6.125 9.240 66.0 8.5 1.315 -20.20 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321242 3.905 3.622 6.125 9.240 72.0 8.0 1.315 -20.20 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321242 3.905 3.622 6.125 9.240 64.0 8.7 1.315 -20.20 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321240 3.905 3.622 6.098 9.240 66.0 10.2 1.340 -2.00 JG6008-3905 Flat Top JE Pistons In stock
321240 3.905 3.622 6.098 9.240 72.0 9.6 1.340 -2.00 JG6008-3905 Flat Top JE Pistons In stock
321240 3.905 3.622 6.098 9.240 64.0 10.4 1.340 -2.00 JG6008-3905 Flat Top JE Pistons In stock
260534 3.905 4.000 6.125 9.240 64.0 9.1 1.115 -25.00 J60008-3900-3 Inv Dome/Dish SRP Back Order
260534 3.905 4.000 6.125 9.240 72.0 8.4 1.115 -25.00 J60008-3900-3 Inv Dome/Dish SRP Back Order
260534 3.905 4.000 6.125 9.240 66.0 8.9 1.115 -25.00 J60008-3900-3 Inv Dome/Dish SRP Back Order
321238 3.905 3.622 6.098 9.240 64.0 8.7 1.340 -21.80 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321238 3.905 3.622 6.098 9.240 66.0 8.5 1.340 -21.80 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321238 3.905 3.622 6.098 9.240 72.0 8.0 1.340 -21.80 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
194883 3.905 - - - - - 1.315 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
194881 3.905 - - - - - 1.050 -2.00 J68008-3900-3 Flat Top JE Pistons Back Order
194882 3.905 - - - - - 1.175 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
264041 3.905 - - - - - 1.115 -10.00 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321237 3.898 3.622 6.098 9.240 64.0 8.7 1.340 -19.50 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321237 3.898 3.622 6.098 9.240 66.0 8.5 1.340 -19.50 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321237 3.898 3.622 6.098 9.240 72.0 8.0 1.340 -19.50 JG6008-3905 Inv Dome/Dish JE Pistons Back Order
321239 3.898 3.622 6.098 9.240 66.0 10.2 1.340 -2.00 JG6008-3905 Flat Top JE Pistons In stock
321239 3.898 3.622 6.098 9.240 72.0 9.6 1.340 -2.00 JG6008-3905 Flat Top JE Pistons In stock
321239 3.898 3.622 6.098 9.240 64.0 10.4 1.340 -2.00 JG6008-3905 Flat Top JE Pistons In stock
326376 3.898 4.000 6.125 9.240 64.0 11.5 1.115 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
326376 3.898 4.000 6.125 9.240 72.0 10.5 1.115 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
326376 3.898 4.000 6.125 9.240 66.0 11.2 1.115 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
326377 3.905 4.000 6.125 9.240 64.0 11.5 1.115 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
326377 3.905 4.000 6.125 9.240 72.0 10.5 1.115 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
326377 3.905 4.000 6.125 9.240 66.0 11.2 1.115 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321248 3.905 4.000 6.200 9.240 72.0 10.5 1.050 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321248 3.905 4.000 6.200 9.240 64.0 11.5 1.050 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321248 3.905 4.000 6.200 9.240 66.0 11.2 1.050 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321247 3.898 4.000 6.200 9.240 72.0 10.5 1.050 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321247 3.898 4.000 6.200 9.240 64.0 11.5 1.050 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321247 3.898 4.000 6.200 9.240 66.0 11.2 1.050 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321246 3.905 3.900 6.125 9.240 72.0 10.2 1.175 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321246 3.905 3.900 6.125 9.240 64.0 11.2 1.175 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
321246 3.905 3.900 6.125 9.240 66.0 11.0 1.175 -2.00 JG6008-3905 Flat Top JE Pistons Back Order
254276 4.005 4.000 6.125 9.240 72.0 8.5 1.115 -29.00 J60008-4000-5 Inv Dome/Dish SRP Back Order
254276 4.005 4.000 6.125 9.240 64.0 9.1 1.115 -29.00 J60008-4000-5 Inv Dome/Dish SRP Back Order
254276 4.005 4.000 6.125 9.240 66.0 8.9 1.115 -29.00 J60008-4000-5 Inv Dome/Dish SRP Back Order