CNC Competition 415/421 Short Block, Callies 3.875 Crank, 6.0 H Beam Rods, Dart Block, Diamond 13.6:1 Nitrous Pistons

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.

Small Block Chevy Short Block Assemble
New Callies Magnum 4340 forged steel crankshaft (3.875 Stroke)
New Callies Ultra H Beam connecting rods bushed fit pins (6.000 Length)
New Diamond forged 7cc race dome nitrous pistons, gas ported with H-13 pins
Total Seal AP steel piston ring set
ACL/Clevite 77 Rod and Main Bearings
Dura Bond cam bearings
Dura Bond finishing kit
Brass freeze plugs
Fel-Pro rear main seal
New Dart Little M sportsman block
**Please specify the amount of nitrous used for proper ring end gap** Compression Ratio with 64cc Heads: 13.6:1

*Professionally Machined, Balanced, Assembled and blue printed in house by CNC-Motorsports. Balance card and blue print sheet will be provided to the customer. All short blocks are standard bore unless otherwise noted. We can custom build any short block assembly to meet your needs.