Throttle Body size diffrence ?
Thread Starter
Drifting
Joined: Nov 2003
Posts: 1,539
Likes: 3
From: South al
From what my book says the early LS1 Throttlebodies are 75mm & the Ls6 are 80mm dont know what the Ls2 is , the Lq4 is also 80mm but it is cable actuated whereareas the Ls6 is Etc,The LQ9 ?
Last edited by fsuforever; Oct 18, 2007 at 09:39 PM.
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
I believe he is reading from the "How to build a Chevy LS1 and LS6/ v-8motor" book. If so, the author is referring to the TB not the MAF, but to the best of my knowledge his sizes in the book are incorrect. I believe the TB for LS1 is 78mm, and the same for the LS6. Not positive though.
Last edited by Johnny Hardcore; Oct 18, 2007 at 10:10 PM.
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
I make 428rwhp and use the stock TB. My buddy Mark, makes 736rwhp, stock TB. The stock unit will work just fine. I personally, would spend my money elswhere.
Last edited by Johnny Hardcore; Oct 18, 2007 at 10:19 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
Thread Starter
Drifting
Joined: Nov 2003
Posts: 1,539
Likes: 3
From: South al
I believe he is reading from the "How to build a Chevy LS1 and LS6/ v-8motor" book. If so, the author is referring to the TB not the MAF, but to the best of my knowledge his sizes in the book are incorrect. I believe the TB for LS1 is 78mm, and the same for the LS6. Not positive though.
,he may allready know 
http://www.performancethrottlebodies.com/Home_Page.php
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
ALL 01-04 C5's (LS1/LS6) used 85mm 5 pin MAF sensors, which also incorporated the IAT sensor in it..
The screen was removed only on the on 02/later LS6s.
Burning Brakes
Joined: Mar 2006
Posts: 750
Likes: 82
From: Bedford IN
The LS2 is 90mm, it is a direct bolt on with a Fast 90 intake on a LS1, with wiring of course
the Ls2 TB is way Bigger 
than the Ls1 throttle Body
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Be careful what you wish for. If you don't have significant mods in other areas of your engine, i.e. heads/cam/exhaust, etc your airflow velocity could take a big dump by bolting on a big TB and you could have a dog not only in perfomance overall, but crappy throttle response as well.
Instructor
Joined: Oct 2011
Posts: 123
Likes: 0
From: Ovid NY
Yea I have full bolt ons full exhaust G5x2 cam on the stock 241 heads Im working on installing a ported fast 78 now and have a bored out/ported stock throttle body opened up to 78mm. should make good numbers going from a non ported ls6
