another throttle body question

[U2SLO450]

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]

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]

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

 

[madspeed]

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

 

[madspeed]

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

YEAH RIGHT!!!

 

[U2SLO450]

YEAH RIGHT!!!

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]

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]

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]

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