budget 383 numbers
Thread Starter
Joined: May 2006
Posts: 961
Likes: 119
From: New Hartford, IA
budget 383 numbers Well after losing the stock shortblock on my new to me h/c Z I built a 383 shortblock and reused the old h/c stuff with a new cam. Car has CNC ls6 heads, comp XER 238 242 cam, ported tb, slightly ported ls6 intake, lg pros w/cats, Borla stingers, Haltec CAI, SVO 30's, 3.90 gears, etc.
The shortblock consists of the origional ls6 block, ARP head and main studs, Clevite, Durabond and ACL bearings, .005" over Mahle pistons, Compstar rods and Eagle crank. I ended up with 11.8 SCR and around 8.4 DCR with GM MLS headgaskets and the pistons ~.010" out of the hole for .045" quench.
The old h/c numbers were 445whp 403wtq. New numbers are 483whp and 445wtq on 92 octane
with a Speed Inc. tune. I can't wait to see what a ported 90/90 setup will do without the cats. I'd like to see 500+ and that seems very possible. The car is a handfull in the cool temps with the newfound power 
The shortblock consists of the origional ls6 block, ARP head and main studs, Clevite, Durabond and ACL bearings, .005" over Mahle pistons, Compstar rods and Eagle crank. I ended up with 11.8 SCR and around 8.4 DCR with GM MLS headgaskets and the pistons ~.010" out of the hole for .045" quench.
The old h/c numbers were 445whp 403wtq. New numbers are 483whp and 445wtq on 92 octane
with a Speed Inc. tune. I can't wait to see what a ported 90/90 setup will do without the cats. I'd like to see 500+ and that seems very possible. The car is a handfull in the cool temps with the newfound power 
TECH Apprentice
Joined: Sep 2005
Posts: 370
Likes: 0
From: DFW, TX
Originally Posted by slowride
Well after losing the stock shortblock on my new to me h/c Z I built a 383 shortblock and reused the old h/c stuff with a new cam. Car has CNC ls6 heads, comp XER 238 242 cam, ported tb, slightly ported ls6 intake, lg pros w/cats, Borla stingers, Haltec CAI, SVO 30's, 3.90 gears, etc.
The shortblock consists of the origional ls6 block, ARP head and main studs, Clevite, Durabond and ACL bearings, .005" over Mahle pistons, Compstar rods and Eagle crank. I ended up with 11.8 SCR and around 8.4 DCR with GM MLS headgaskets and the pistons ~.010" out of the hole for .045" quench.
The old h/c numbers were 445whp 403wtq. New numbers are 483whp and 445wtq on 92 octane with a Speed Inc. tune. I can't wait to see what a ported 90/90 setup will do without the cats. I'd like to see 500+ and that seems very possible. The car is a handfull in the cool temps with the newfound power
The shortblock consists of the origional ls6 block, ARP head and main studs, Clevite, Durabond and ACL bearings, .005" over Mahle pistons, Compstar rods and Eagle crank. I ended up with 11.8 SCR and around 8.4 DCR with GM MLS headgaskets and the pistons ~.010" out of the hole for .045" quench.
The old h/c numbers were 445whp 403wtq. New numbers are 483whp and 445wtq on 92 octane
with a Speed Inc. tune. I can't wait to see what a ported 90/90 setup will do without the cats. I'd like to see 500+ and that seems very possible. The car is a handfull in the cool temps with the newfound power sounds like you have a 515/480 combo in the future with ported 90/90
fread beans pontiac a forum vendor on corvette forum is selling brand new LS2 90's for $281 shipped
www.s2performance.net send your tb to him, he just did mine, i dont have dyno numbers yet, but from what i can see his ported tb is the best. he ports them all the way thru to the back, unlike many that just port the front opening. btw, shanner will and can port a fast 90 as well. although he has no dyno numbers to back up his work.
lt1dave is doing ported fast 90's for $895 shipped, at least he did mine for that much.
Trending Topics
TECH Enthusiast
Joined: Jul 2003
Posts: 507
Likes: 2
From: Ankeny, IA
I figured that about had to be you. Not to many stroker Z06's here in lA. I'm taking my car over to FLP next week to get it tuned. I'd like to see 440+rwhp. These old Absolute Speed heads flow pretty well, so we'll see if they have it in them. Hopefully next summer you'll be around so we can take a look at your car or better yet get a ride in it.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
