CNC SB Chevy 355 Super Light Weight Short Block, Eagle 41.5 lb Crank, Eagle Featherweight H Beam Rods, JE Pistons

Looking for Professional quality and Reliable Performance? CNC-Motorsports will give you just that!

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 for 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 perfection in our craftsmanship to provide our customers with the performance and professional quality work that is second to none that you as a customer expect to pay for. Here at CNC-Motorsports we can make 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.



Small Block Chevy 350 Competition Short block

New Eagle 4340 Forged Steel Crankshaft 41.5 pounds, internal balance (Early Style 2 piece rear main seal "1968 - 1986")
New Eagle "ESP" 3-D Featherweight H-Beam connecting rods w/ ARP 2000 Rod Bolts ( Bushed Fit Pins ) - 540 grams
New JE FSR Lightweight Flat Top high performance forged 2618 alloy aluminum pistons, with pins and locks
Total Seal MaxSeal Gapless Top rings
Clevite 77 Triarmor coated high performance rod & main bearing set
Seasoned 4 bolt main block with ARP main bolts
Dura Bond Coated Cam Bearings
Dura Bond Finishing Kit
Pioneer Freeze Plugs
Victor Reinze Rear Main Seal
Professionally Machined, Assembled and Blue Printed in our shop

Short Block Upgrades
Dart Little M Block all Caps Splayed (add $ 1,200.00)
Clevite 77 Triarmor Coated Bearings (add $ 108.00)
Splayed Main Caps (add $ 525.00)
3.500 Stroke Crank

Seller Phone Number: 800-341-1528

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Item Location: BROOKINGS, SD Get Directions To This City

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