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.
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CNC-1252-CS PART NUMBER
CNC SB Chevy 415/421 Compstar Balanced Rotating Assembly - 13.7:1 JE Dome Pistons, Balanced$3,330.95
SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, JE 5.6cc Dome Pistons, 2-PC Seal, Balanced Assembly
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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-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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CS-422-CPF PART NUMBER
Compstar SB Chevy 415/421 Stroker Kit, Balanced Assembly, CP Pistons 11.6:1 Flat Top$2,996.95
SB Chevy 415 421, Compstar Crankshaft 3.875 Stroke, 350 or 400 Main, Compstar 6.000 H Beam Rods, CP Pistons -6.9cc Flat Top, Rings, Bearings, Balanced Assembly Learn More -
CS-421-CPD PART NUMBER
Compstar SB Chevy 415/421 Stroker Kit, Balanced Assembly, CP Pistons 13.5:1 Dome$3,044.95
SB Chevy 415 421, Compstar Crankshaft 3.875 Stroke, 350 or 400 Main, Compstar 6.000 H Beam Rods, CP Pistons +5.1cc Dome, Rings, Bearings, Balanced Assembly Learn More