Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

Porting the TB.

Thread Tools
 
Search this Thread
 
Old Aug 29, 2006 | 01:31 PM
  #1  
JD_Z28's Avatar
Thread Starter
TECH Fanatic
iTrader: (19)
 
Joined: Jul 2005
Posts: 1,166
Likes: 1
From: Arizona
Default Porting the TB.

Does anyone know the mm size of a average ported ls1 throttle body. I would like to know the before and after diff.
Reply
Old Aug 29, 2006 | 01:47 PM
  #2  
black01_WS6's Avatar
TECH Junkie
iTrader: (13)
 
Joined: Sep 2004
Posts: 3,857
Likes: 0
From: Fort Myers, FL.
Default

I was wondering the same thing, I would guess it would only be a difference of a mm or two.
Reply
Old Aug 29, 2006 | 01:55 PM
  #3  
JD_Z28's Avatar
Thread Starter
TECH Fanatic
iTrader: (19)
 
Joined: Jul 2005
Posts: 1,166
Likes: 1
From: Arizona
Default

Originally Posted by black01_WS6
I was wondering the same thing, I would guess it would only be a difference of a mm or two.
Probably, but what mm size is the stock one. I'm sure the polishing helps the most.
Reply
Old Aug 29, 2006 | 02:17 PM
  #4  
black01_WS6's Avatar
TECH Junkie
iTrader: (13)
 
Joined: Sep 2004
Posts: 3,857
Likes: 0
From: Fort Myers, FL.
Default

stock is 78mm
Reply
Old Aug 29, 2006 | 02:36 PM
  #5  
Shallow Bay's Avatar
TECH Resident
iTrader: (3)
 
Joined: Jul 2005
Posts: 878
Likes: 1
From: Twin Cities, MN
Default

Stock - 72.5mm
Ported - 75.5mm
Reply
Old Aug 29, 2006 | 02:57 PM
  #6  
JD_Z28's Avatar
Thread Starter
TECH Fanatic
iTrader: (19)
 
Joined: Jul 2005
Posts: 1,166
Likes: 1
From: Arizona
Default

So is stock 72.5 or 78mm?
Reply
Old Aug 29, 2006 | 03:10 PM
  #7  
Shallow Bay's Avatar
TECH Resident
iTrader: (3)
 
Joined: Jul 2005
Posts: 878
Likes: 1
From: Twin Cities, MN
Default

A stock throttle body is listed as a 75mm throttle body. The lip in front of the blade (which you remove while porting) only makes it around a 72.5mm throttle body. Make sense?
Reply
Old Aug 29, 2006 | 03:16 PM
  #8  
JD_Z28's Avatar
Thread Starter
TECH Fanatic
iTrader: (19)
 
Joined: Jul 2005
Posts: 1,166
Likes: 1
From: Arizona
Default

Originally Posted by Shallow Bay
A stock throttle body is listed as a 75mm throttle body. The lip in front of the blade (which you remove while porting) only makes it around a 72.5mm throttle body. Make sense?
Thanks. Good to know info.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-1

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-2

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-3

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-4

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-5

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-6

10 Camaros You Should Never Buy

 
story-7

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
story-8

Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

 Brett Foote
story-9

10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

 Verdad Gallardo
Old Aug 29, 2006 | 04:37 PM
  #9  
Bo White's Avatar
TECH Addict
20 Year Member
iTrader: (59)
 
Joined: Oct 2004
Posts: 2,357
Likes: 0
From: Vance, Alabama
Default

Yes, the blade and the housing around the blade is 75mm but the lip in front of the blade is what your taking out(among other things) which makes the TB a true 75mm.
Reply
Old Aug 29, 2006 | 05:42 PM
  #10  
slimcracka's Avatar
TECH Fanatic
iTrader: (7)
 
Joined: Dec 2004
Posts: 1,555
Likes: 0
From: pensacola, fl.
Default

Originally Posted by Bo White
Yes, the blade and the housing around the blade is 75mm but the lip in front of the blade is what your taking out(among other things) which makes the TB a true 75mm.

are you still messing with any of these anymore? if so pm me...
Reply
Old Aug 30, 2006 | 08:10 AM
  #11  
Mr Incredible's Avatar
TECH Fanatic
 
Joined: Apr 2005
Posts: 1,231
Likes: 1
From: Just This Side of Damnation
Default

Thanks for the tip, Bo.

I did mine last week, but was afraid to work on the lip. I must have misunderstood the other posts I'd read...I thought the lip needed to stay (at least some of it) or it would be the end of the world. I guess they just meant that you don't want to get into the opening and make it bigger than the blade.

Is that correct, then, that you get the lip but don't go bigger than the blade?

I feel like such a newb...
Reply
Old Aug 30, 2006 | 08:20 AM
  #12  
MiaSSmaro98's Avatar
TECH Fanatic
iTrader: (9)
 
Joined: Jun 2005
Posts: 1,682
Likes: 0
From: Miami,Fl
Default

the early truck t-body are 78 mm good for an extra set of ponies ,but the car's t-body are 75mm
Reply
Old Aug 30, 2006 | 09:22 AM
  #13  
SSWahoos's Avatar
Teching In
 
Joined: Aug 2006
Posts: 8
Likes: 0
From: Virginia
Default

Does anyboby know is there a place you can trade your TB in for one that is already been ported?
Reply
Old Aug 30, 2006 | 04:01 PM
  #14  
orangefun's Avatar
11 Second Club
iTrader: (5)
 
Joined: Sep 2005
Posts: 752
Likes: 0
From: visalia california
Default

yes thats what i want to know any one
Reply
Old Aug 30, 2006 | 05:11 PM
  #15  
Bo White's Avatar
TECH Addict
20 Year Member
iTrader: (59)
 
Joined: Oct 2004
Posts: 2,357
Likes: 0
From: Vance, Alabama
Default

I havent seen a 78mm TB on the trucks, doesnt mean that they do not exist- Ive swapped blades in and out of em with the vette and fbody ones because of various reasons without a problem. The bleed hole on the truck TBs(70123 part # blade I believe) is however smaller than the fbodys by about .020"
Reply
Old Aug 30, 2006 | 05:31 PM
  #16  
JD_Z28's Avatar
Thread Starter
TECH Fanatic
iTrader: (19)
 
Joined: Jul 2005
Posts: 1,166
Likes: 1
From: Arizona
Default

Originally Posted by Bo White
I havent seen a 78mm TB on the trucks, doesnt mean that they do not exist- Ive swapped blades in and out of em with the vette and fbody ones because of various reasons without a problem. The bleed hole on the truck TBs(70123 part # blade I believe) is however smaller than the fbodys by about .020"
Doing the port and polish, does it help with the performance a lot. I'm running a turbo kit so I would think it would help me a lot, or should I buy a aftermarket one.
Reply
Old Aug 30, 2006 | 08:37 PM
  #17  
staringback05's Avatar
TECH Senior Member
iTrader: (8)
 
Joined: Apr 2006
Posts: 6,695
Likes: 2
Default

what size turbo are you running? and if you have the money yea, just get a bigger TB....a ported stock tb will give you a nice upgrade for the amount of time and effort you put into it....
Reply
Old Aug 31, 2006 | 04:37 AM
  #18  
Bo White's Avatar
TECH Addict
20 Year Member
iTrader: (59)
 
Joined: Oct 2004
Posts: 2,357
Likes: 0
From: Vance, Alabama
Default

Cablebandit ran one of mine for a long time with twin turbos(incons I think). He seemed to like it pretty good and it was an older port design.
Reply




All times are GMT -5. The time now is 08:02 AM.

story-0
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-1
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-2
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-3
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-4
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-5
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-6
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-7
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE
story-8
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0

The world was a better place when it was still around.

By Brett Foote | 2026-01-23 09:20:37


VIEW MORE
story-9
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever

Slideshow: The 7.0-liter LS7 was designed for absolute cutting-edge performance.

By Verdad Gallardo | 2026-01-07 18:36:00


VIEW MORE