421ci SBC High Boost E85 Project
421ci SBC High Boost E85 Project Finally got the wedding out of the way, now on to the important stuff 
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 it and start again.
This time I started with a Dart Little M block. I'll post up some pictures of that tonight.
I 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:
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):
More later - just unpacked the block.
Jim
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 it and start again.
This time I started with a Dart Little M block. I'll post up some pictures of that tonight.
I 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:
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):
More later - just unpacked the block.
Jim
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I have 2 setups and I am fabricating a bracket system that allows me to switch in under 2 hours.
First I'm installing the Vortech YSi with a custom 10-rib setup.
The 421/YSi will replace the current 383/T-trim setup here, pretty much a plug n' play except for having to do a new blower intake adapter for the larger YSi, the 10-rib setup and E85 conversion:
The second setup will be a Whipple 3.3. This is what I was going to use on the 434 but it seemed a shame to limit it to 12# or less:
Cam for both is a new Comp solid roller, 250/256@.050", net lift .693"I/.701E", 115LSA.
More tomorrow.
Jim
First I'm installing the Vortech YSi with a custom 10-rib setup.
The 421/YSi will replace the current 383/T-trim setup here, pretty much a plug n' play except for having to do a new blower intake adapter for the larger YSi, the 10-rib setup and E85 conversion:
The second setup will be a Whipple 3.3. This is what I was going to use on the 434 but it seemed a shame to limit it to 12# or less:
Cam for both is a new Comp solid roller, 250/256@.050", net lift .693"I/.701E", 115LSA.
More tomorrow.
Jim
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I am running a huge Bell FMIC, 2048cfm.
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.
Jim
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.
Jim
Here's a few more I snapped last night:
New modified Hamburger Valvecovers. I added a -10 fitting above the stock baffles for venting, added a good-sized filler on a standoff, and beadblasted them in prep for coating:
Here's the modified Motown Single Plane - Set up for injectors, fully ported and port-matched, this will now flow enough air in all ports to support the head. I also cut apart a NOS Big Shot Plate to make a spraybar that could be embedded in the manifold. I needed to do this to retain the stock, flat hood for the visual sleeper look:
Closeup of the spraybar. There is masking tape covering the spraybars until everything is done. After final work on the manifold, I will have it coated (probably clear), then epoxy in the spraybar and give the top of the manifold a quick flushcut:
For those of you who haven't seen my 81 Malibu 4DR sleeper:
Underneath it's a bit more serious (The fuel cell has been painted with black undercoating where visible outside the car):
Trunk action:
More later today.
Jim
New modified Hamburger Valvecovers. I added a -10 fitting above the stock baffles for venting, added a good-sized filler on a standoff, and beadblasted them in prep for coating:
Here's the modified Motown Single Plane - Set up for injectors, fully ported and port-matched, this will now flow enough air in all ports to support the head. I also cut apart a NOS Big Shot Plate to make a spraybar that could be embedded in the manifold. I needed to do this to retain the stock, flat hood for the visual sleeper look:
Closeup of the spraybar. There is masking tape covering the spraybars until everything is done. After final work on the manifold, I will have it coated (probably clear), then epoxy in the spraybar and give the top of the manifold a quick flushcut:
For those of you who haven't seen my 81 Malibu 4DR sleeper:
Underneath it's a bit more serious (The fuel cell has been painted with black undercoating where visible outside the car):
Trunk action:
More later today.
Jim
Last edited by DeltaT; Apr 28, 2010 at 01:01 PM.
