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

 

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 sensitivity 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 ***.

 

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.
More is not always more.

 

Good point I never thought of it that way....Must be that saying kicking in (Bigger is always better)
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