Chevy 355 Short block IMCA Modified

CNC-motorsports Competetion 355 Short block. Scat 4340 Crank, Scat Pro Comp 6" I Beam rods, Manley Forged Flat Top Pistons

Here at CNC-Motorsports our short blocks start with premium cores. We then 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. 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 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 excellance in our craftsmanship to provide our customers with the correct performance parts at a perfect price.







SB Chevy 350 3.480" Crank, 6.0 Rods,

1. Scat 4340 Steel Crank 3.480"

2. Scat 4340 Steel Pro Comp I beam rods with 7/16" cap screws

3. Manley Forged Flat Pistons 10.2:1

4. Total Seal Pistons Rings

5. Clevite 77 Rod & Main Bearings

6. 4 bolt GM block, 2 piece rear main seal,

7. Dura Bond Performance Cam Bearings

8. Dura Bond Finishing Kit

9. Pioneer Brass Freeze Plugs

10. Victor Reinze Rear Main Seal

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