ripgtp97

iTrader: (2)

So i've got a couple questions about what to go with.

- stock size is 75.. i would assume to go bigger, but why do some guys drop down to a 52 mm?

- with a stock ls1 intake, and a volant CAI what size throttle bodies will fit? doi need any adapter plates to make them fit if i go above a certain size? also if i upgrade to an ls6 intake or fast.. then what throttle bodies will work

anything you recommend is helpful too!

zracer323

iTrader: (12)

Nobody uses a 52mm throttle body on an LS1. Maybe on an LT1?
A CAI has nothing to do with throttle body size. The same size throttle bodies came on every LS1 f-body regardless of whether it had a LS1 intake or LS6. A FAST will require a new throttle body. There's really no point of changing the throttle body unless you upgrade to a larger intake. Just port the stock one.

ripgtp97

iTrader: (2)

ah okay thanks, i guess the last 2 questions im wondering than is if i do buy a bigger one say 85 before i upgrade my intake, will it still bolt up to the intake?and will it also stillfit into my volant connection? do i need a new bellow from the CAI to the throttle body itself to compensate for the bigger diameter throttle body?

also, i know one company not sure if they are sponsored here portsthe stock for 75 bucks to i think 78mm.. is that really going to make much of a difference?

MonmouthCtyLS7

iTrader: (6)

A cheap ported stocker is all you need...and yea 52mm is a LT1 tb upgrade, I believe stock its a 48

MonmouthCtyLS7

iTrader: (6)

85 will bolt right up but save your money and just get a ported stock(same gains), or port your own. You'll notice some nice throttle responce and somewhere around 7 hp gain..90mm or above tb's are usually the 4 bolt patterns(yours is 3)......theres several vendors and members that do it here cheap if you dont feel up to it, or you can find used for 50-75 bucks.

ripgtp97

iTrader: (2)

so which engine/intake is the 4 bolt TB's for? and also just a port/bump stop is as good as purchasing an 85? it'll def save money but don't want to skimp out unless it really is almost as good

SOMbitch

iTrader: (8)

There is really nothing to port on a stock LS1/6 intake. Get your TB ported and you will feel better throttle response but the HP gain is minimal....

MonmouthCtyLS7

iTrader: (6)

LS2 is a 4 bolt...You wont be skimping a 200 plus dollar 80-85mm tb will give you no more power then a 50 dollar ported stocker

ripgtp97

iTrader: (2)

alrighty, sounds good to me, thanks guys

99ls1zam

Sorry to steal your thread but i was reading and wondering what to port on my tb ? I would like to do it on my Ls1.

SOMbitch

iTrader: (8)

There used to be a youtube vid that walked you through it.... Might wanna search for that or there is prolly a writeup in genIII external if the search is working for you...

Alex2210

Just port it and you be good to go!

99Z28camaroman

iTrader: (10)

Just buy a ported one off Ebay $39 if you send im your core. The one with the ***** pic!

Is this for for another car becase your asking about throttle bodies and intake but your signature says P&P TB and LS6 intake!

99Z28camaroman

iTrader: (10)

My ported throttle body arrived and I got the one off Ebay the one with the ***** pic $39.99 with core refund. It's really done well good workmanship. it fitted it in ten minutes and it runs fine. I would recomend this guy he is very helpful to deal with. I think he wa selling powercoated different colour TBs on here on the Classifieds.

lemons12

iTrader: (71)

Ls1s don't respond much from a larger tb, especially with stock intakes because of their design.. Tony preaches this regularly. Port bump stop etc the stock one and go with it.. Upgrade to a 90 or 92 when you buy a fast.

LT1TECH

i have a lt1 and im buying a 58mm holley friday am i wasting my money or will i be able 2 feel a diffrence?im also putting a cold air intake on it friday.. my car is completly stock btw.

lemons12

iTrader: (71)

I believe the lt1s respond decent, I know that is a very common first mod in the Lt1 world.

D14HUGGER.ORANGE

I bought fast 102mm intake, and fast 92mm throttle body. On my 99ss I have a slp lid, will the rubber bellow fit the 92mm throttle body?

lemons12

iTrader: (71)

Are you talking the stock accordion style bellow?

It will take a few swear words and about five minutes but it will work. After you put it on the first time drive the car until operating temp for about ten mins, then let it cool completely.. After that it should be much easier to get on and off.

There is a company that makes pieces that work perfectly as bellows. They are rubber, can be colored, etc.. All different sizes and turns. Can't recall the name, search a little.

D14HUGGER.ORANGE

Not the stock bellow but the bellow from the SLP lid. I dont know if your fimiliar with it, I was just trying to mitigate any issue before the install.