[seniorgearhead]

Can anyone tell me what the dia. of the stock 4.6L v8 throttle
body is ?

[02 shaker]

I believe it is 65mm.

[seniorgearhead]

Thanks for the reply. I thinking about a bigger throttle body,but can,t decide how big to go. The engine is stock other than FlowMaster system and then BBK CAI.

[zachyd23]

75mm throttle body and c&l intake plenum combo worked great for me from American Muscle

[AMShaneLesky]

OP,

Tons of our 2v GT customers run the BBK 78mm Throttle body Intake. It's a very nice affordable part, that replaces the TB and upper intake, as one. Which is especially helpful since the stock upper intake is very restrictive. We've seen solid gains of 12-15hp over stock. I think it's exactly what you're looking for.

Let me know if you have any questions!

Shane

[Lackey'sGT]

Originally Posted by zachyd23

75mm throttle body and c&l intake plenum combo worked great for me from American Muscle

I would go with this or a 70mm but no bigger then 75mm.

[racin366]

Go 75mm, but do the upper plenum as well, that is a major restriction in the stock setup. Have not seen a single drawback from going 75 over 70 and it has some room to grow later.

[redriderjf87]

Originally Posted by racin366

Go 75mm, but do the upper plenum as well, that is a major restriction in the stock setup. Have not seen a single drawback from going 75 over 70 and it has some room to grow later.

I know there have been a million threads on it, but do you think there's any torque reduction going from 70 to 75? Assuming replacing the plenum at the same time.

[Hood Time]

Is the gain worth the cost?

Lesky claims 12hp. Is that on a completely stock car, no tune? Or is that the sales pitch? Lol

[ivanhouston10]

75mm unless you plan on going with forced induction in the future, go with something bigger.

[racin366]

Originally Posted by Hood Time

Is the gain worth the cost?

That is something only you can answer. It shows gains across the rpm's and some better response, but what that is worth is up to you.