How can I identify what throttle body i have?
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Joined: Dec 2012
Posts: 161
Likes: 1
From: Lincoln, Illinois
Car: 92 Trans Am, 87 Formula
Engine: 305 soon to be TBI, 91 305 TPI swap
Transmission: 700R4
Axle/Gears: 10 bolt
How can I identify what throttle body i have?
I purchased an intake that came with a throttle body. I was told its a 52mm but it looks stock but has 17086051 0288 JPA casted in the body and 75396 numbers on the blades. I can't seem to find any information on this. Yes I Googled. All I could find is throttle bodies for sale, no info. Anyone know anything about these? Thanks in advance
Joined: Nov 2008
Posts: 2,093
Likes: 175
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: How can I identify what throttle body i have?
All GM factory throttle bodies are 48mm unless bored out in a rebuilding. Aftermarket are all 52 or 58. (At least I've never seen a 48mm Aftermarket) Those all look like gm cast numbers but if you really want to know, measure it.
Member
Joined: Dec 2020
Posts: 224
Likes: 5
From: Arkansas
Car: 1988 Trans Am GTA
Engine: 5.7 L98
Transmission: 700R4
Axle/Gears: 3.77
Re: How can I identify what throttle body i have?
17086051 is a 48mm stock gm throttle body. But that doesn't mean they didn't port it bigger
Joined: Oct 2001
Posts: 12,214
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: How can I identify what throttle body i have?
Txt me a pic or post it here of it from the front and one from the rear.
Joined: Nov 2008
Posts: 2,093
Likes: 175
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: How can I identify what throttle body i have?
Judging by my crusty TB I pulled off an 87, he has a stock bore 48mm, and the julian date suggests it's an 88.
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