Throttle Body Size
 

Hi,
I want to install new throttle body and spacer on my 86 gt 5.0L but wasn't sure of the size to use on the stock motor. I have a BBK air induction system on it already. Should i stick with BBK?
Any help and tips is greatly appreciated.

Thanks............Gus thumb:

Hello Gus,
You would probly be good with a 70mm, no sence doing a 65 since you might upgrade in the future and 70mm is really all you need.
Yes my suggestion is to buy the 70mm BBK.
Awesome TB I have the same one and no complaints.

Keith

id get the 75m if i were you i dont know if they have them for 5litres but yes i would go for the bbk ones...

i got the tb and spacer on my car as well sounds great when u hit the gas and i did notice a diffrence as well in the pedals sensitivitythumb: great mod!

On a mostly stock motor I would stick with a 65mm TB, anything larger will just cost you torque.

^I agree 100%, 70 or 75mm are WAY too big! a 60-65mm would work well.

I realize there might be some bottlenecking there, but what if he does other mods in the future? like H/C/I and maybe a turbo / S/Ger then he has to upgrade no?
Just a thought.....

I was going to say 65mm but I thought of future mods...

I still have a 65 on mine with H/C/I and a blower, and it still hauls ass.

Nothing to do with bottlenecking.
It's just that 70mm+is way too big for a stock or mildly modded 5.0. You will lose more than you gain if you put on a TB that big.
Would be like putting on a 4" full exhaust, power will be lost instead of gained. no:
More is not always more.

Good point ;) I never thought of it that way....Must be that saying kicking in (Bigger is always better) wall:
Ill keep that info to pass on to someone else.
Thanks

Thanks everybody for the great advice. Think i'm going with the 65mm.

Thank Again.............Gus