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CNC-1253-MR PART NUMBER
CNC SB Chevy 415/421 Molnar Rotating Assembly - 14.7:1 JE Dome Pistons$3,350.95
SB Chevy, Molnar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, JE 10.8cc Dome Pistons, 2-PC Seal
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CNC-1254-CS PART NUMBER
CNC SB Chevy 415/421 Compstar Balanced Rotating Assembly - 14.7:1 JE Hollow Dome GP Pistons$3,554.95
SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, JE 10.8cc Hollow Dome GP Pistons, 2-PC Seal Learn More -
CNC-1256-CS PART NUMBER
CNC SB Chevy 415/421 Compstar Balanced Rotating Assembly - 12.0:1 JE Flat Top Pistons$3,301.95
SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, JE -5cc Flat Top Pistons, 2-PC Seal
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CNC-1261-CS PART NUMBER
CNC SB Chevy 415/421 Compstar Balanced Rotating Assembly - 12.0:1 SRP Professional Flat Top Pistons$2,986.95
SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, SRP Professional -5cc Flat Top Pistons, 2-PC Seal
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CNC-1262-CS PART NUMBER
CNC SB Chevy 415/421 Compstar Balanced Rotating Assembly - 10.6:1 SRP Professional Dish Pistons$3,083.95
SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, SRP Professional -16cc Dish Pistons, 2-PC Seal, Balanced Assembly
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CNC-1264-CS PART NUMBER
SB Chevy 415/421 Compstar Rotating Assembly, Balanced - 8.5:1 Diamond Race Dish Pistons$3,629.95
SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, Diamond -38cc Race Dish Pistons, 2-PC Seal, Balanced Learn More -
CNC-1266-CS PART NUMBER
CNC SB Chevy 415/421 Compstar Rotating Assembly - 14.7:1 Diamond Race Dome Pistons, Balanced$3,743.95
SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, Diamond 11cc Race Dome Pistons, 2-PC Seal, Balanced Assembly
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CNC-1269-CS PART NUMBER
CNC SB Chevy 415/421 Compstar Rotating Assembly - 13.8:1 Diamond Nitrous Dome Pistons, Balanced$3,868.95
SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, Diamond 7cc Nitrous Dome Pistons, Total Seal AP Steel Rings, 2-PC Seal, Balanced
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ESP-12147 PART NUMBER
Eagle 12147 SBC 415/421 Pro Rotating Assembly Kit, -22cc Mahle Dish Pistons, 2-PC Rear SealSpecial Price $2,540.95 Regular Price $2,590.95
SB Chevy 415/421 Stroker Pro Rotating Assembly Kit, Eagle 4340 Forged Steel Crankshaft 3.875 Stroke, 400 Main, Eagle 6.000 H-Beam Rods, Mahle 4032 Forged -22cc Dish Pistons, 2-PC Rear Seal, Performance Rings and Bearings Included
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ESP-12046 PART NUMBER
Eagle 12046 SBC 415/421 Pro Rotating Assembly, -22cc Mahle Dish Pistons *350 Main*Special Price $2,558.95 Regular Price $2,608.95
SB Chevy 415/421 Stroker Rotating Assembly Kit, Eagle 4340 Forged Steel Crankshaft 3.875 Stroke, 350 Main, Eagle 6.000 H-Beam Rods, Mahle 4032 Forged -22cc Dish Pistons, 2-PC Rear Seal, Performance Rings and Bearings Included Learn More
CNC-Motorsports offers the best selection of Small Block Chevy 415-421 rotating assembly kits. We offer street kits with pump gas pistons to wild fully forged rotating assembly kits to meet your racing needs. We offer quality name brands such as; Eagle, Scat, Callies, Compstar, Crower, Lunati, JE/SRP, Diamond, Wiseco, Mahle CP and Keith Black to name a few. CNC-Motorsports can customize any stroker kit to meet your specific needs. All balanced rotating assembly kits are completed in house by CNC-Motorsports. If you don’t see the stroker kit you're wanting feel free to call or email our experienced staff today.