stburgpete

Can anybody help?

RamAir95TA

iTrader: (2)

There are one or two companies that can do it for you. It isn't something that you can do yourself unless you have a mill to bore out the throttle body blades evenly.

Once they are bored out, larger blades are installed.

Trans Am Jam

iTrader: (7)

http://www.gmhightechperformance.com/tech/0311htp_ls1_fbody_10_free_modifications/index.html

or

go to this archive and find the Throttle Body Porting Link and download the how-to

http://www.bowlingss.com/LS1_How_To.htm

RamAir95TA

iTrader: (2)

This IS the LT1 forum you know?

96lt1m6

iTrader: (31)

FYI:
ported tb stuff is for Ls1 style motors

Lt1 just get larger tb IE:52,54,58mm and of course the mono blade
typical mods do not require the use of a larger than stock TB I do believe 6spd cars respond to bigger TB better,thats my experience.

MasterTomos

iTrader: (15)

the 52's and 58's arent all that expensive, you can just buy one for about $300 rather than dinkin around with the stock one.

97pontta

iTrader: (10)

You will need to have a milling machine to bore the throttle body and a way to machine new 52mm throttle blades with the proper elliptical shape (they are not round). If your after a 52mm (which is the largest the stock TB can be bored SAFELY) you can get one for about $125 with your stocker as a core.

stburgpete

Everybody is giving good info. The reason I started asking this question is because of the sticky it say all you need is a dremel

koolaid_kid

iTrader: (21)

Your intake is usually 52mm, and the stock TB is 48mm. So going to a 52mm is not really a bad thing. You can pick up a used one fairly cheap. I prefer a ported stock myself. Ran one for years, and noticeable power increase (along with CAI and catback, of course). You really have to increase airflow all the way through, in and out, for the best results.
You can smooth the TB, but porting will require new blades.

MasterTomos

iTrader: (15)

A dremel wouldn't be too precise...plus with the bigger ports/openings you'd need bigger valves...

z_speedfreak

iTrader: (3)

you can port LT1 tb's, 97pontta was close but you can actually port a stocker to 54mm.

97pontta

iTrader: (10)

Some of the castings can be ported to 54mm, even then you have to offset the throttle bores so you don't breach the upper vacuum port that runs from the passenger side valve cover to the upper fitting on the TB. I've ported many LT1 throttle bodies and the majority can only go to 52mm SAFELY. I stick to 52mm because at 54mm the casting walls are very thin, around .030 or less in some areas, with it being cast aluminum it can fracture easily. The last thing I would want is one of my throttle bodies failing and damaging someone’s engine. Also most intake manifolds have 52mm openings which allows for the throttle body to be bolted on without touching the intake manifold.

z_speedfreak

iTrader: (3)

wow, thats good to know!