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11-11-2008, 04:40 AM
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The 383 @ 9psi that broke... R.I.P.!
It's been a year since the Tahoe's had boost under the hood. In November of '07 the snout broke off the forged GM HT383 crankshaft and set me back a bit. That engine was a GM HT383 shortblock with Edelbrock E-Tec 200 heads, Crower 00401LM cam (214/220, 114º .51") 1.6:1 Roller rockers, 62# Injectors, Vortec marine intake manifold, 2-bar tuned, long-tube headers and dual 3" exhaust. It had a 10.5" converter with 3800RPM-RPM stall speed into a built 4L80-E trans with a Gear Vendors overdrive and then to a 10.5" 14-bolt rear end with Eaton Posi. Boost came from a heavily modified Whipple Vortec 5.7 kit upgraded with the W140AX compressor - space for which was made by replacing the OEM vacuum brake booster with hydroboost. It had a 80mm throttle body. The compressor bracket outlet was modified to connect to a large air-to-water intercooler that I fabricated the mounting and plumbing for.
Despite weighing 5800 pounds even then with the smallblock, this was by far the funnest thing to drive I've ever been in. I miss the power, as I knew I would when I decided last November to start over with the Vortec 454. I acquired two used ones, the better of which went into the truck and the other went on the stand for mockup. I've got even more ambitious plans for this. To make 9psi with the 383 I had to run a 2.5" pulley and was redlining the compressor at the top of the RPM range. Making RPM in the tens of thousands in the supercharger with such a small pulley resulted in lots of belt-shredding, so from that experience I've picked up some insight I intend to apply to this next project. The bigblock is getting a 3.3L compressor and an 8-rib dedicated drive belt located on a pulley between the balancer and OEM 6-rib pulley. The supercharger itself will go on the passenger side. The mock-up 454 on the stand will probably a stroker kit, Trickflow heads, cam, rockers, etc. The project is still mostly conceptual, but I've got some photos and videos from when the 383 was running it's best (right before I broke it!) Complete:   Heat Exchanger: http://bertok.us/pics/w140AX/coolers.JPG Mock-up before TIG: http://bertok.us/pics/ic_plumbing3.jpg Bypass Detail: http://bertok.us/pics/bypass1.jpg More Mock-up: http://bertok.us/pics/plumbing3.jpg IAT Relocation: http://bertok.us/pics/iat.jpg VIDEOS: The tires on the truck at this time were 305mm wide Nittos. Street tires could not hook up from a dig. Ever! http://bertok.us/pics/traction.mpg For this one I've got M&H drag radials on it and warmed up. (P.S. - filming and driving is sorts awkward at the same time...) http://bertok.us/pics/0-120.mpg The rear brakes on the 14-bolt are stronger than stock, but not stronger than BOOST: (Toyos on in this vid) http://bertok.us/pics/burnout5.mpg This one's just some revving with the cats off, loud as hell, but fun: http://bertok.us/pics/OpenHeaders.avi This was the end of the 383...  So, now I've got this Vortec 454 in it...  It runs comparatively lethargic like this for now... http://bertok.us/pics/454WOT.mpg But, I've got THIS ONE on the stand in the garage awaiting some attention: http://bertok.us/pics/altbracket.jpg EDIT: Thanks Mike for finding me this alternator relocation bracket - it saved me HOURS! That about covers the last three years or so. 2009 is looking good...
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"James B." '99LT_Tahoe4Dr2WD, Tuned L29 Vortec 454, 62#Injectors, Cutouts, 4L80-E 10.5"14bolt ,EatonPosi-4.56:1, Gear_Vendors, HydroBoost, (NEXT: Brodix heads, 230/240 cam, SS roller rockers, longtubes, THEN: Intercooled W200R-8psi in the future...) Last edited by James B.; 11-11-2008 at 04:49 AM. 
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11-11-2008, 11:46 PM
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Quote:
Jared
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 www.lethalperformance.com 877-2LETHAL Whipple Supercharger's Largest US Distributor 05-09 Mustang 550hp Kits NOW SHIPPING! Fore Precision Works MEGA Distributor SAME DAY SHIPPING!!
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11-12-2008, 06:28 PM
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Quote:
James, Man I remember back years ago when you were just starting to work on this! I bet that thing hauled the mail, can't wait to see what you got going with the big block! Dustin
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Dustin Whipple  Whipple Superchargers 3292 N. Weber Fresno, CA 93722 559.442.1261 dustin@whipplesuperchargers.com
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12-24-2008, 11:05 PM
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Why not come over to the 8.1L dark side? Forget the GEN V stuff, enter the GEN VI world...
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2003 8.1L 2500HD LT Allison 5spd trany 4.10:1 posi rear 60lb Motrons Corsa Cat Back Whipple S/C'er @ 6.5psi Whipple A2W Intercooler
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12-25-2008, 04:39 AM
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Quote:
The bad about the 8100: - unique head bolt pattern, can only use OEM or Raylar heads - unique intake with symetrical ports, can only use Gen-VII intake - limited aftermarket parts availability - no siamesed version block ever made, so bore limited to 0.060" over The good about the 8100: - coil per plug ignition, distributorless - electronic throttle control - symetrical intake ports - more equal efficiency - tall deck block - no "missing" head bolts due to intake port locations With the 454 I can't do anything about the "missing" head bolts with the stock block, nor can I do anything about the non-symetrical intake ports, but there are MANY aftermarket head choices and even one-piece seal stroker cranks and forged balanced rotating assemblies available. All my aftermarket investments can swap later to a "502cid" siamesed block if I want more bore, or to a "572cid" tall deck block if I want more stroke and bore. It would be nice to have electronic throttle control and to ditch the distributor in favor or coil-per-plug ignition, right? Well... look what I have going on here, from the extremely rare medium-duty version of the 454 that had distributorless ignition AND ETC!: (That is a 24x reluctor, I intend to run this with a 411 PCM and it will look exactly like a de-stroked 8100 with a different firing order!) 
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12-25-2008, 11:42 AM
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yeah its odd to me that there is such a limited amount of after market stuff for the
8.1L. If you dont have Raylar's phone number....you dont have after market parts. They do have a stroker crank for the 8.1L now.....but i think i would have to mortgage my house to get it. I will be getting the Raylar heads, cam, and intake this summer. Those additions + the whipple should yeild some pretty decent HP/TQ numbers even if all I can get out of the 2.3L whipple is 5psi. CR goes up with those heads as well...from 9.1:1 up to 10.1:1. Would be nice if someone made a blower manifold for the non-marine version of the 8.1L. either way James....I cant wait to see some VIDs of the new setup you got going, especially that 3.3L on there....whoa!
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2003 8.1L 2500HD LT Allison 5spd trany 4.10:1 posi rear 60lb Motrons Corsa Cat Back Whipple S/C'er @ 6.5psi Whipple A2W Intercooler Last edited by Whippled 496; 12-25-2008 at 11:44 AM.
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02-16-2009, 06:06 PM
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James, How did you like the crowler cam in your 383. I just put together my motor and got a used whipple kit for my 93 2dr yukon. I am only going to run about 6-7 lbs of boost.
also Dustin I will be calling you in a few days I need some Misc parts that I did not get in the kit.
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02-16-2009, 10:08 PM
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The Crower cam (00401LM) in the 383 was a fairly good match. It was 114 LSA and very mild, good for boost. Were I to do it over I would opt for a cam either shorter in duration or 115 or more LSA. That cam was fine up to 6psi. Later on when I pushed the 383 to nine and ten pounds it started burning cats with the throttle wide open. Destroyed two sets.
Michael can help you with parts, he's helped me out more than a few times with the obscure weirdness I've always got going on over here...
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02-17-2009, 12:35 AM
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I got the 383 torn down this weekend, it will live again soon. The new crank is a Lunati forged 4340 internally balanced piece. 3.75" stroke. The GM HT383 crank was externally balanced, 3.8" stroke. The pistons will go back into the same holes and I'm not going to worry about the extra 0.025" worth of combustion chamber height at TDC. The extra volume will serve boost better.
It will get new bearings - mains and rods, seals, gaskets, etc. I bought one new HT383 rod to balance the new crank with so I don't have to break down a piston, the stuff going down to the machine shop this or next week. I won't be using this block again myself, it will be sold as a complete shortblock ready to go. My focus now is the bigblock.  ] 383 pistons in the foreground, mostly. (One stock L31 on the tight and stock L29 in the back) all awaiting cleaning...  Check out these cranks: Forged 4340 Lunati on left, Forged 4340 GM HT383 center, stock Cast Vortec 350 (L31) right: 
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02-23-2009, 02:07 PM
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Thanks for the insight
the motor is up and running just getting it tuned a bit before int whipple install. Truck pulls very well as it sits I am sedning the compressor to High Speed labs for a rebuild just to be safe. Fully forged bottom end KB forged 18cc dished pistons AFR 180s performerTBI manifold, 68LBS injectors bored TBI. Hooker LT's and truck 2.5's out the baco with High Flow cats. 4:10s with a eaton posi Built 460LE with a transgo HD2 shiftkit and other goodies 2dr yukon 4x4
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