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04-27-2010 #1Starting The Transformation
- Join Date
- Jun 2005
- Posts
- 467
421ci SBC High Boost/E85/Blower/N2O Project
Finally got the wedding out of the way, now I can start working on my dream project.
I had a medium-boost 434 planned and actually had the short block ready but got enough feedback on my original choice of piston (too high a ring pack for higher boost) that I decided to sell the entire Motown shortblock and start again. Funny how moving the rings down 1/8" can affect decisions throughout the entire bottom end.
This time I started with a Dart Little M block, and worked with Howards Cams on a rotating assembly good to at least 1200HP.
Some initial pictures:
Custom JE Forged Pistons, with Tuff Skirt and Ceramic coatings, Tool Steel Pins:
Howards Cams Forged Billet Rods with L-19 capscrews:
Howards Cams American-Forged 4340 Crank, with Big Block Snout and double keyways for a hefty blower drive:
Some top end shots (some of you have already seen these):
New AFR 235cc fully CNC'd heads, Inconel Exhaust Valves, 700# Solid Roller Pacalloy Springs:
Intake port shot:
Mock-up with the T&D Shaft Rockers (1.7Int/1.8Exh):
Here's the finish-machined Dart Little M block:
4.155" bore, 3.875" stroke for the 421ci:
I went with the billet steel maincaps on this one. The inner bolts will be replaced with ARP mainstuds:
Next - a thorough cleaning for everything, then I'll start test fitting stuff and file-fitting the Hellfire ring set.
More pix to follow.
JimDon't take a knife to a gunfight.
Half-Assed = Half-Fast
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04-27-2010 #2