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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SCA-1-40901 PART NUMBERScat 1-40901 SB Chevy 415/421 Competition Rotating Assembly - 11.8:1 CP Flat Top Pistons$2,396.954340 Forged Standard Weight Crankshaft 3.875 Stroke, 350 Main, 6.000 H-Beam Rods, CP Forged -6.8cc Flat Top Pistons, 2-PC Rear Seal Learn More
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SCA-1-41564 PART NUMBERScat 1-41564 SB Chevy 415/421 Competition Rotating Assembly - 11.8:1 CP Flat Top Pistons$2,386.954340 Forged Standard Weight Crankshaft 3.875 Stroke, 400 Main, 6.000 H-Beam Rods, CP Forged -6.8cc Flat Top Pistons, 2-PC Rear Seal Learn More
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SCA-1-40901BI PART NUMBERScat 1-40901BI SB Chevy 415/421 Competition Balanced Rotating Assembly - 11.8:1 CP Flat Top Pistons$2,646.954340 Forged Standard Weight Crankshaft 3.875 Stroke, 350 Main, 6.000 H-Beam Rods, CPForged -6.8cc Flat Top Pistons, 2-PC Rear Seal, Balanced Learn More
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SCA-1-41564BI PART NUMBERScat 1-41564BI SB Chevy 415/421 Competition Balanced Rotating Assembly - 11.8:1 CP Top Pistons$2,636.95
4340 Forged Standard Weight Crankshaft 3.875 Stroke, 400 Main, 6.000 H-Beam Rods, CP Forged -6.8cc Flat Top Pistons, 2-PC Rear Seal, Balanced
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ESP-12032 PART NUMBEREagle 12032 SBC 415 421 Competition Rotating Assembly Kit 12.0:1 Mahle Pistons$2,238.95SB Chevy 415/421 Stroker Rotating Assembly Kit, Eagle 4340 Forged Steel Crankshaft 3.875 Stroke, 400 Main, Eagle 6.000 H-Beam Rods, Mahle 4032 Forged -5cc Flat Top Pistons, 2-PC Rear Seal, Performance Rings and Bearings Included Learn More
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ESP-12132 PART NUMBEREagle 12132 SBC 415 421 Rotating Assembly Kit 12.0 Mahle Flat Top Pistons 350 Main$2,238.95SB 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 -5cc Flat top Pistons, 2-PC Rear Seal, Performance Rings and Bearings Included Learn More
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ESP-35640 PART NUMBEREagle 35640 SB Chevy 415 421 Rotating Assembly 13.5 JE Dome Pistons$2,691.97Small Block Chevy 415 421 Rotating Assembly Kit, Eagle 4340 Forged Steel Crankshaft, 3.875 Stroke, 400 Main, Eagle 6.000 H-Beam Rods, JE 2618 Forged +5.6cc Dome Pistons, 2-PC Rear Seal, Performance Rings and Bearings Included Learn More
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ESP-35650 PART NUMBEREagle 35650 SB Chevy 415 421 Rotating Assembly 14.5 JE Dome Pistons$2,691.97Small Block Chevy 415/421 Rotating Assembly Kit, Eagle 4340 Forged Steel Crankshaft, 3.875 Stroke, 400 Main, Eagle 6.000 H-Beam Rods, JE 2618 Forged +10.8cc Dome Pistons, 2-PC Rear Seal, Performance Rings and Bearings Included Learn More
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CNC-1249-CS PART NUMBERCNC SB Chevy 415/421 Compstar Rotating Assembly - 12.0:1 Mahle Flat Top Pistons$2,522.95SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, Mahle -5cc Flat Top Pistons, 2-PC Seal Learn More
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CNC-1250-CS PART NUMBERCNC SB Chevy 415/421 Compstar Rotating Assembly - 13.5:1 Mahle Dome Pistons$2,583.95SB Chevy, Compstar 4340 Forged Crankshaft 3.875 Stroke, 350 or 400 Main, 6.000 H Beam Rods, Mahle 4cc Dome Pistons, 2-PC Seal Learn More