What size throttle body?

alecracing · Feb 17, 2009

Do you guys use. I have a 351 w/ trick flow intake and heads. car has a BBK 75mm and was wondering if I should go bigger?

and what MAF do you guys run?

95Vert383AOD · Feb 17, 2009

My 351 is now a 383. I use a 90mm Throttle Body and a SCT 90mm MAF. If using forced induction i hear you can get away with smaller. But i went from a 75mm to a 90mm and the biggest difference is throttle response. It also depends on the heads and what your power goals are.
'
Chris

alecracing · Feb 17, 2009

95Vert383AOD said:
My 351 is now a 383. I use a 90mm Throttle Body and a SCT 90mm MAF. If using forced induction i hear you can get away with smaller. But i went from a 75mm to a 90mm and the biggest difference is throttle response. It also depends on the heads and what your power goals are.
'
Chris

Any reason you went with a 383 instead of 408??

95Vert383AOD · Feb 17, 2009

Has a awesome rod ratio.....Great for revs. Very fast reving motor with the right heads. So when i finally decide to turbo it that will make the car spool that much quicker. Alot of people say they want cubes over revs....i went the rev. route. 6.25 Chevy rods 8.75 Crank. Came as a kit.

Grn92LX · Feb 17, 2009

you have the 75mm so keep it. that trickflow intake should fit a 90mm i believe.

Venom351R · Feb 17, 2009

They make the 75MM opening and 90MM opening for the Trick Flow, at least on the R version anyway.

95Vert383AOD · Feb 17, 2009

I have a spare 75mm Trickflow R upper

earleys94gt · Feb 17, 2009

Unless you want to make the absolute most HP you can, the 75mm will be fine.

If the intake opening is only 75mm and you put on the 90mm, you will still flow only 75mm.

Even if the opening is 90mm, the 75mm will still flow a good amount of air.

Venom351R · Feb 17, 2009

I run a 75 MM TB with a 97MM meter

95Vert383AOD said:
I have a spare 75mm Trickflow R upper

That's terrible, you should give it to me

alecracing · Feb 18, 2009

Redline_351R said:
That's terrible, you should give it to me

+1

if you donate it to my school, it is a tax write-off

95Vert383AOD · Feb 18, 2009

alecracing said:
+1

if you donate it to my school, it is a tax write-off

Oh well it has a cracked bolt ear....it hasn't snapped off i just haven't found anyone who can weld cast aluminum.

alecracing · Feb 18, 2009

Okay so i will stick with the 75mm for now.

So What MAF sensors do you guys use? The PRO-M was the hot ticket 15 years ago when i use to race.

95Vert383AOD · Feb 18, 2009

alecracing said:
Okay so i will stick with the 75mm for now.

So What MAF sensors do you guys use? The PRO-M was the hot ticket 15 years ago when i use to race.

I have a SCT with a 4 wire adapter.....I may go pro-m in the future for ease of tuning. You can tell them what you're running and they can specifically calibrate your MAF for your setup......this can save a couple of hours when tuning time comes. The SCT i have is for the 6 pin lightnings and cobras. It has a different voltage output.....and can be tuned to work with the older 4 wire computers. But then again tuning and more tuning and the possibility of it never being "just right". I haven't tried pro-m but i think i may in the future.

YEAHLOH95 · Feb 18, 2009

i have always had good luck with pro-m meters

Stopsign32v · Feb 18, 2009

earleys94gt said:
If the intake opening is only 75mm and you put on the 90mm, you will still flow only 75mm.

How exactly are you going to put a 90mm TB on a 75mm opening?

5spd GT · Feb 18, 2009

Stopsign32v said:
How exactly are you going to put a 90mm TB on a 75mm opening?

It still bolts up, no matter the diameter.

Stopsign32v · Feb 18, 2009

5spd GT said:
It still bolts up, no matter the diameter.

I figured there would be some contact from the 90mm blade to the 75mm spacer or what have you but there isn't. Still who is dumb enough to put a 90mm TB on a 75mm opening? Just have the intake opening ported to a 90mm.

Stopsign32v · Feb 18, 2009

alecracing said:
Do you guys use. I have a 351 w/ trick flow intake and heads. car has a BBK 75mm and was wondering if I should go bigger?

and what MAF do you guys run?

90mm TB and a 90mm Lightning or bigger MAF would be ideal...

What size throttle body?

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