CNC Competition SB Chevy 406 Short block

CNC Competition SB Chevy 406 Short block, Eagle Crankshaft, Eagle 6.0 Rods, SRP 11.6:1 Pistons

Here at CNC-Motorsports our short blocks start with premium cores. We first start by clean, magnaflux, and sonic test the thrust sides of the cylinder walls for a minimum of .200� thickness after overbore. All blocks are then line honed to get a baseline for all of the BHJ blueprinting fixtures. From this point we square up the decks using BHJ�s Blok-Tru to get the desired deck heights. Once this is done we bore the block using BHJ�s Bore-Tru to get the desired spacing. There are quite a few blocks that are not able to have this done, due to they are either to far off from the factory or previously bored in the past. Either way we utilize this procedure when possible.



The next step is the honing process. We install main caps and torque plates to ensure cylinder bores ends up as true to actual running conditions as possible. In our honing process we aim for around 30º crosshatch to achieve the most compression while still allowing the rings to travel. Bores are measured with plates still attached and recorded on the blue print sheet. Once all the machine work is completed, the block is washed and prepped for assembly. During the assembly process, all components are measured and corrected to obtain correct clearances. All of these measurements are recorded on the blueprint sheet. Rotating assemblies in these short blocks are all weight matched within 2 grams, and the crankshaft is balanced with in ½ of a gram.



Here at CNC Motorsports we strive for excellence in our craftsmanship to provide our customers with the performance parts at a perfect price.



Here at CNC-Motorsports we have over 10,000 different short block, long block or complete engine packages. We will build for nearly every application, please call us 800-341-1528 for a quote on your build.



SB Chevy 400 Short Block Assembly

· Eagle forged 4340 steel cranksahft, internal balanced

· Eagle forged 4340 steel H beam connecting rods with arp 7/16 cap screw bolts

· SRP forged Pistons

· Performance Moly Pistons Ring Set

· Clevite 77 high performance rod & main bearing set

· Seasoned 2 bolt main block with ARP main bolts, driverside dipstick

· Dura Bond Cam Bearings

· Dura Bond Finishing Kit

· Pioneer Brass Freeze Plugs

· Victor Reinze Rear Main Seal

CNC-Motorsports
Brookings, South Dakota
Toll free 800-341-1528
e-mail clint@cnc-motorsports.com
web site: www.cnc-motorsports.com

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