SMALL BLOCK CHEVY 412 SHORT BLOCK

WE HAVE OVER 5000 DIFFERENT SHORT BLOCK COMBINATIONS, GIVE US A CALL 800-341-1528
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CNC Competition 412 Short Block, 3.800" Crank, 6.0 H Beam Rods, Dart Block, JE 13.0:1 Pistons

Here at CNC-Motorsports our short blocks start with a new Dart SHP block. 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, 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 best possible product money can buy

All Dart SHP blocks will be standard bore unless the customer requests over bore. No extra charge for over bore.



Small Block Chevy Short Block Assembly

New Scat/Eagle 4340 forged steel crankshaft
New Eagle H-Beam connecting rods ( Bushed Fit Pins )
New JE forged high performance aluminum pistons, with pins and locks
High performance Plasma moly piston ring set
ACL/Clevite 77 Rod & Main Bearings
Dura Bond Cam Bearings
Dura Bond Finishing Kit
Freeze Plugs
Victor Reinze Rear Main Seal
New Dart SHP Block
Professionally Machined, Balanced, Assembled and blue printed in house by CNC-Motorsports. Balance card and blue print sheet will be provided to the customer.

ARP 2000 / L19 Rod Bolts (add $ 90.00)
Total Seal Gapless Top Rings (add $ 165.00)
Tri Armor Coated Rod & Main Bearings (add $ 125.00)
Dart Little M Sporstman Block (add $ 700.00)
Dart Little M Competition Block (add $ 1,100.00)
Lightweight Eagle Crankshaft (add $ 200.00)
Lightweight Scat Crankshaft (add $ 425.00)

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Item Location: BROOKINGS, SD

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