another throttle body question

U2SLO450

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May 27, 2006

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Apr 18, 2007

#1

• Apr 18, 2007

• #1

Im getting ready to do my H/C/I swap on my 90 gt. I have the cobra upper and lower, e-cam and gt40p heads with 1.94/1.54 valves and .550" springs, Now the question is what size throttle body do i need, i hear half the people say 65mm and half say to get the 70. The car is a daily driver and will not see any more mods. Any suggestions?

 

5spd GT

"the 5.0 owns all"

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#2

• Apr 18, 2007

• #2

If it is indeed 'no more mods' a good brand like Accufab, Holley, Eddy 65mm will flow plenty. Some think 'bigger is better' in this case, but they will flow all you need, either 65, 70, 75.

 

Grn92LX

Fidanza Man!

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#3

• Apr 18, 2007

• #3

70 is the ticket. It's what matches the inlet.

 

madspeed

Colonel Mustard

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#4

• Apr 18, 2007

• #4

I'd go 70mm as well. The inlet opening of the upper plenum is also 70mm.

 

madspeed

Colonel Mustard

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#5

• Apr 18, 2007

• #5

U2SLO450 said:

The car is a daily driver and will not see any more mods.

Click to expand...

YEAH RIGHT!!!

 

U2SLO450

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Apr 18, 2007

#6

• Apr 18, 2007

• #6

madspeed1 said:

YEAH RIGHT!!!

Click to expand...

The only other thing i have planned is maybe having the cylinders and bearings freshened up some. That brings up another question, Should i have the cylinders and bottom end done as well at the same time? I had planned on just throwing on the H/C/I and going. It seems like its pretty strong right now and plus i dont want to have to pull the motor. So do you think it will be fine with a stock bottom end?

 

5spd GT

"the 5.0 owns all"

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#7

• Apr 18, 2007

• #7

How many miles you got?

More that likely you are fine, I did my h/c/i swap with 142k and replaced the bottomend because I wanted to at 163k.

 

U2SLO450

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#8

• Apr 18, 2007

• #8

170,000 and running strong, theres no noise or smoke, it holds good oil pressure and it doesn't burn any oil so i hope it will be alright. It wont be seeing much abuse at the track so it should be fine right?

 

5spd GT

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#9

• Apr 18, 2007

• #9

Should be - a compression check would be more accurate. From what you say, I say slap them on and see how it goes!