Throttle body size

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Nov 18, 2007 | 08:37 PM

NetrixTardis

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From: San Antonio, TX

Throttle body size

so, the 2002's T/A 's had the LS6 intakes. i've read somewhere (tho i can't find it anymore) that the TB size is a 70mm, and the LS6 intake can take up to 75mm... anyone have info to confirm/deny this?

Nov 18, 2007 | 09:32 PM

mikenews

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Factory tb is about 72mm. We remove the restrictive .0120" ridge and just about achieve 75mm total opening when we port them. The actual opening is larger but not sure how much. Anyone???

Nov 18, 2007 | 10:01 PM

NetrixTardis

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hmm. so, whats the largest size that the LS6 intake will bolt up with?

Nov 19, 2007 | 11:21 AM

mikenews

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I believe 90mm. I would just have your factory ported and polished. Save your $ for other mods. Factory TB's modified work very well!

Nov 19, 2007 | 01:01 PM

5.0stang

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So what is the official throttle body size?

Anyone got a picture?

Nov 19, 2007 | 03:12 PM

Smokin87TA

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After porting a stock tb is a true 75mm all the way through. From factory they are right around 71.5mm. An ls6 intake opening is 78mm so with anything larger than that you would have to use a reducer, this making it pointless going larger since the air has to restrict to get into the intake. Ported stocker and ls6 is a proven combo, next is to step up to a 90/90.

Nov 19, 2007 | 04:25 PM

5.0stang

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So I am assuming the small part of the throttle body is on the firewall side, or on the radiator side?

What horsepower are the ported 75mm throttle bodies good too?

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Nov 20, 2007 | 07:23 AM

BlackScreaminMachine

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From: Wallingford CT

Quote:

Originally Posted by NetrixTardis

hmm. so, whats the largest size that the LS6 intake will bolt up with?

Best bud put on a FAST 78mm TB, works fine. He kinda regrets since he cant use it unless he stayed with a 78mm FAST intake, he wants a 90mm, but im sure he can sell it.