CAM BEARING INSTALLATION
Note: The cam bores feature sharp edges. To aid in camshaft bearing installation, first deburr the edges with a sharp scraper. Once all block grinding, tapping, and deburring was finished, the block was thoroughly washed, rinsed, and blow-dried, with 5W30 engine oil applied to the cylinder walls to prevent surface-rusting. The camshaft bearings [...]
PROJECT 632, PART 3
SHORTBLOCK ASSEMBLY
Our shafts rotate and the slugs run up ‘n down. Life is good.
by Mike Mavrigian
photos by author
Clevite coated main and rod bearings were used for pre-fitting and final assembly.
Building a stroker bad boy isn’t a walk in the park, as anyone who has been down this road knows all too well. [...]
The valve reliefs were cut with precision. The intake pockets are 0.270″ and exhaust pockets are 0.064″.
Notice that the pin bore location encroaches into the oil ring groove. Diamond supplied a set of support rails that are installed prior to the oil ring package. These provide footprint support for the oil ring package.
Scott Gressman torques [...]
HONING THE CYLINDERS
Following a recommendation from our buddies at Sunnen, we visited Gressman at Gressman Powersports in Fremont, Ohio (Gressman has built a number of 632 motors, in addition to countless big-number drag, sprint car and road-race engines). Naturally, the Ohio winter weather forced us to drive in sub-zero temperatures. Even with the block boxed [...]
PROJECT 632, PART 2
We hone the block and determine bottom-end clearances.
by Mike Mavrigian
photos by author
With our new pistons in hand, it was now time to hone the cylinders to size.
As you may recall from our previous article, our target is to build an all-motor 632 cubic-inch big block featuring 15:1 compression, enabling us to produce [...]
Dart 11-Degree Big Chief Cylinder Head Specs
P/N………………………18500000
Material…………………355T6 aluminum alloy
Comb. Chambers……….56cc (70cc also available)
Intake valve dia…………2.470″
Intake port dim. …………1.815″ x 2.725″ w/3/4″ radius
Intake port volume………FP CNC – 497cc
Intake port location……..Raised 1.500″ spread ports
Exhaust valve dia………1.800″
Exhaust port volume……185cc
Exhaust port dim………..2.020″w x 1.780″h
Exhaust port location……angled & raised 0.900″ extended flange w/BBC bolt pattern
Intake flow………………520cfm [...]
DART RACE SERIES BLOCK
Dart’s new monster big block offers a choice between 10.600″ or 11.100″ deck heights, a cam tunnel that’s moved up 0.600″ for better connecting rod clearance with stroker cranks and a choice between 4.840″ or 4.900″ bore spacing. The new tall-deck block offers engine builders great versatility with variable lifter locations and [...]
We build a big, big block drag mill
just for the sheer hell of it.
by Mike Mavrigian
photos by author
Some folks love to claim that bigger is not always better. While that may be true in some cases, let’s face it…when the conversation turns to displacement, well, bigger cain’t never hurt. After all, if you feed any [...]
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