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Unread 02-03-2013   #1 (permalink)
seniorgearhead is offline Rookie

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Default Stock Throttle Body

Can anyone tell me what the dia. of the stock 4.6L v8 throttle
body is ?
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Unread 02-03-2013   #2 (permalink)
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I believe it is 65mm.
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Unread 02-03-2013   #3 (permalink)
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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.
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Unread 02-03-2013   #4 (permalink)
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75mm throttle body and c&l intake plenum combo worked great for me from American Muscle
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Unread 02-04-2013   #5 (permalink)
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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
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Unread 02-04-2013   #6 (permalink)
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Quote:
Originally Posted by zachyd23 View Post
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.
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Unread 02-04-2013   #7 (permalink)
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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.
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Unread 02-04-2013   #8 (permalink)
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Quote:
Originally Posted by racin366 View Post
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.
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Unread 02-05-2013   #9 (permalink)
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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
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Unread 02-06-2013   #10 (permalink)
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75mm unless you plan on going with forced induction in the future, go with something bigger.
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Unread 02-07-2013   #11 (permalink)
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Quote:
Originally Posted by Hood Time View Post
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.
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