CNC Competition Short Block, SB Ford 454, 4.250" Eagle Crank, 6.300" Eagle 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 new Dart Iron Eagle premium cores. We start by seasoning the new Dart block, we run each block threw 7 to 10 heat cycles before we do any machine work. New blocks have a tendency to change .001 to .002 thousands after the heat cycles are complete. All blocks are checked and then line honed if needed 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.

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.



SB Ford 454 Short Block Assembly



New Eagle 4340 forged steel crankshaft
New Eagle "ESP" 3-D H-Beam connecting rods ( Bushed Fit Pins )
New JE high performance aluminum pistons, with pins and locks, Customer choice of compression ratio
High performance plasma moly piston ring set
Clevite 77 Rod & Main Bearings
Dura Bond Cam Bearings
Dura Bond Finishing Kit
Pioneer Brass Freeze Plugs
Victor Reinze Rear Main Seal
New Dart Iron Eagle Sportsmen Block
Build time is 4 weeks



Crankshaft Stroke Rod Length Piston Type Piston Brand Compression Ratio

58 CC
Compression Ratio 72cc
4. 250 6. 300 Customers Choice
JE Custom Pistons -20cc is 11.8:1 Custom Pistons -20cc is 10.3:1

Seller Phone Number: 800-341-1528

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Item Location: BROOKINGS, SD Get Directions

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