For All Your High Performance Needs


SB Chevy 415, 421 Short Blocks


CNC-Motorsports, has quickly raised the bar to a new level in offering high quality short blocks at an affordable price. Our short blocks have become a huge hit among racers and performance enthusiast all over the world. We have the ability to custom build you just about any combination the way you want it. All our short blocks are 100% machined, CNC Machined and blue-printed to our race wining specs. We never cut corners like others just to lessen the price.

We literally have hundreds of short block options we can offer. We have listed the most common set ups. Please call us if your looking for something not listed and we will be more than happy to give you a quote.

Items 1 to 15 of 46 total

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    CNC Competition 415/421 Short Block, Eagle 3.875 Crank, 6.0 H Beam Rods, Dart Block, Mahle 9.9:1 Pistons

    Part Number: CNC-9459-E

    $4,029.95

    Dart SHP Block, Eagle 3.875 Forged Crankshaft, Eagle 6.0 H Beam Stroker Rods, Mahle 9.9:1 Dish Pistons

    Manufacturer: CNC-Motorsports

  2. CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 14.5:1 Pistons

    CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 14.5:1 Pistons

    Part Number: CNC-9366-CS

    $4,799.95

    Dart SHP Block, Compstar 3.875 Forged Crankshaft, Compstar 6.0 H Beam Stroker Rods, JE 14.5:1 Hollow Dome Pistons Gas Ported

    Manufacturer: CNC-Motorsports

  3. CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 14.5:1 Pistons

    CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 14.5:1 Pistons

    Part Number: CNC-9366-S

    $4,389.95

    Dart SHP Block, Scat 3.875 Forged Crankshaft, Scat 6.0 H Beam Stroker Rods, JE 14.5:1 Hollow Dome Pistons Gas Ported

    Manufacturer: CNC-Motorsports

  4. CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 13.1:1 Pistons

    CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 13.1:1 Pistons

    Part Number: CNC-9367-CS

    $4,659.95

    Dart SHP Block, Compstar 3.875 Forged Crankshaft, Compstar 6.0 H Beam Stroker Rods, JE 13.1:1 Flat Top Pistons for 18 Degree Heads

    Manufacturer: CNC-Motorsports

  5. CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 13.1:1 Pistons

    CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 13.1:1 Pistons

    Part Number: CNC-9367-S

    $4,239.95

    Dart SHP Block, Scat 3.875 Forged Crankshaft, Scat 6.0 H Beam Stroker Rods, JE 13.1:1 Flat Top Pistons for 18 Degree Heads

    Manufacturer: CNC-Motorsports

  6. CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, Diamond 13.8:1 Pistons

    CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, Diamond 13.8:1 Pistons

    Part Number: CNC-9371-CS

    $4,659.95

    Dart SHP Block, Compstar 3.875 Forged Crankshaft, Compstar 6.0 H Beam Rods, Diamond 13.8:1 Dome Pistons

    Manufacturer: CNC-Motorsports

  7. CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, Diamond 13.8:1 Pistons

    CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, Diamond 13.8:1 Pistons

    Part Number: CNC-9371-S

    $4,239.95

    Dart SHP Block, Scat 3.875 Forged Crankshaft, Scat 6.0 H Beam Stroker Rods, Diamond 13.8:1 Dome Pistons

    Manufacturer: CNC-Motorsports

  8. CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 15.4:1 Pistons

    CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 15.4:1 Pistons

    Part Number: CNC-9368-CS

    $4,659.95

    Dart SHP Block, Compstar 3.875 Forged Crankshaft, Compstar 6.0 H Beam Rods, JE 15.4:1 Dome Pistons for 18 Degree Heads

    Manufacturer: CNC-Motorsports

  9. CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 15.4:1 Pistons

    CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 15.4:1 Pistons

    Part Number: CNC-9368-S

    $4,239.95

    Dart SHP Block, Scat 3.875 Forged Crankshaft, Scat 6.0 H Beam Stroker Rods, JE 15.4:1 Dome Pistons for 18 Degree Heads

    Manufacturer: CNC-Motorsports

  10. CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, Diamond 11.7:1 Pistons

    CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, Diamond 11.7:1 Pistons

    Part Number: CNC-9369-CS

    $4,659.95

    Dart SHP Block, Compstar 3.875 Forged Crankshaft, Compstar 6.0 H Beam Rods, Diamond 11.7:1 Flat Top Pistons

    Manufacturer: CNC-Motorsports

  11. CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 14.5:1 Pistons

    CNC Competition 415/421 Short Block, Scat 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 14.5:1 Pistons

    Part Number: CNC-9364-S

    $4,239.95

    Dart SHP Block, Scat 3.875 Forged Crankshaft, Scat 6.0 H Beam Stroker Rods, JE 14.5:1 Dome Pistons

    Manufacturer: CNC-Motorsports

  12. CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 14.5:1 Pistons

    CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 14.5:1 Pistons

    Part Number: CNC-9364-CS

    $4,659.95

    Dart SHP Block, Compstar 3.875 Forged Crankshaft, Compstar 6.0 H Beam Rods, JE 14.5:1 Dome Pistons

    Manufacturer: CNC-Motorsports

  13. CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 13.5:1 Pistons

    CNC Competition 415/421 Short Block, Compstar 3.875 Crank, 6.0 H Beam Rods, Dart Block, JE 13.5:1 Pistons

    Part Number: CNC-9363-CS

    $4,659.95

    Dart SHP Block, Compstar 3.875 Forged Crankshaft, Compstar 6.0 H Beam Stroker Rods, JE 13.5:1 Dome Pistons

    Manufacturer: CNC-Motorsports

  14. CNC SB Chevy 415 Un-Assembled Dart Short Block, Eagle 3.875 Crank, 6.0 H Beam Rods, Mahle 9.9:1 Pistons

    CNC SB Chevy 415 Un-Assembled Dart Short Block, Eagle 3.875 Crank, 6.0 H Beam Rods, Mahle 9.9:1 Pistons

    Part Number: CNC-9378-UNE

    $3,669.95

    Dart SHP Block, Eagle 3.875 Forged Crankshaft, Eagle 6.0 H Beam Stroker Rods, Mahle 9.9:1 Dish Pistons, Un-assembled

    Manufacturer: CNC-Motorsports

  15. CNC SB Chevy 415 Un-Assembled Dart Short Block, Eagle 3.875 Crank, 6.0 H Beam Rods, Mahle 13.3:1 Pistons

    CNC SB Chevy 415 Un-Assembled Dart Short Block, Eagle 3.875 Crank, 6.0 H Beam Rods, Mahle 13.3:1 Pistons

    Part Number: CNC-9359-UNE

    $3,669.95

    Dart SHP Block, Eagle 3.875 Forged Crankshaft, Eagle 6.0 H Beam Stroker Rods, Mahle 13.3:1 Dome Pistons, Un-assembled

    Manufacturer: CNC-Motorsports

Items 1 to 15 of 46 total

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