What size TB??

1fastsn95

New Member

Apr 22, 2005

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Carthage, tn

Apr 15, 2007

#1

• Apr 15, 2007

• #1

I just got a cobra intake and I want to know what size TB to go with. Its a 87 w/ SD. It has Mac headers, O/R Hpipe, flows, & 4:10 gear. Since my valve covers are leaking, Im going to replace them as well and add 1.7 RRs also. What size TB would you guys go with?? 65? 70? 75? Ive always heard bigger is better......most of the time. Lemme know!! Thanks!!

 

Grn92LX

Fidanza Man!

Founding Member

Jan 14, 2001

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129

New York

Apr 15, 2007

#2

• Apr 15, 2007

• #2

70mm will be fine at that level. 70 is appx what the inlet opening is. Match the tb to the inlet, if you need bigger, break out the dremel and port match it.

 

Foxfan88

My Grandpa has great wood.

Sep 13, 2004

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Miami, Ok

Apr 15, 2007

#3

• Apr 15, 2007

• #3

70mm, its a good jump from stock. i dont see the logic in swaping to a 65mm as its only 7mm bigger, not much of a difference. if your going to get a TB, GET !a TB! lol

if the 70 is too big it wont matter. wont affect performance at all it will just make the gas touchier, and if u plan to mod it more you will grow into the TB later on.

good luck

 

N8Miller

I need NOS....make it 2 of the big ones

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Jul 26, 2000

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Apr 15, 2007

#4

• Apr 15, 2007

• #4

65mm will give great throttle response, but 70mm is a better option.

 

5spd GT

"the 5.0 owns all"

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Aug 7, 2002

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Apr 15, 2007

#5

• Apr 15, 2007

• #5

A 65mm throttle body will flow plenty, just get one of the more renowned companies - Accufab, Edelbrock, Holley, etc.

A 70mm won't be a big difference at all and will go well with that stroker you do later

The larger mm throttle body you get, the touchier your gas pedal will be...

If you like that...get a 'big' one. Don't expect more horsepower, it won't happen...good luck!

The 'big one' could go well with a supercharger later though!