CNC Competition BB Chevy 638 Dart Short Block, Eagle Crank, Diamond 14.4:1 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.

BB Chevy 638 Short Block Assembly
New Eagle 4340 forged steel crankshaft (4.750 Stroke) **Internal Balance**
New Eagle H-Beam connecting rods bushed fit pins with 7/16 ARP 8740 bolts (6.700 Length)
New Diamond forged 34cc dome pistons with H-13 tool steel wrist pins (4.600)
Total Seal AP Steel piston ring set
ACL/Clevite 77 Rod and Main Bearings
Dura bond cam bearings
Brass freeze plug kit
Dura bond finishing kit
New Dart Big M sportsman block, tall deck 10.180"
Compression Ratio with 118cc Heads: 14.4:1
Compression Ratio with 124cc 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. *Ships Truck Freight*