hi guy's ,this is my first time.
here is my question please help me out .
is 87 -92 iroc TPI thorttle body is the same or what.
i'am looking for a TB for 88 iroc 305 auto and i found some TB's but years are like 91-92 0r 90 is it gone be fit or i dont know please help me give me some info.

 

their pretty much all the same depending what size motor it came off of.the 5.7's are bigger than the 5.0 tpi.they bolt up it just that the opening is bigger on the 5.7's.if you have a 305 motor and you put a 350 tb on you may run rich,or if you put a 305 tb on a 350 motor you mite run lean

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1991 banditt2 firebird #130of#600

 

The size of openings is the same(48 mm) on all 85 - 92 TPI TB's. In fact the same TB is used on the RamJet 502 crate motor. The 305 TPI uses smaller injectors(19 lbs/hr vs 22 lbs/hr).

 

88IROCs is right. There's absolutely no difference in size between the 305 and 350 throttle bodies. The only difference is the throttle linkage between years. 85-88 is one style, 89-92 is the other style.



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89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

 

The Idle Air Control pathing to the plenum is also different between the older and newer models.

May be other variations besides this and the cables as mentioned earlier, just be aware the two designs are not interchangeable.

As for the guy who said sizes differ between 305 and 350, this is incorrect.

-Kevin

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1982 Z-28

See http://www.mycar.net/mafb/registry/detail.cfm?id=276 for details

 

If you're looking for a TB for an 88 TPI, you need one that will fit 85-88 TPI cars.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Yep, you can use a later model tb on your early model setup. I think people w/ later model TPIs can use the early model tb though.



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87 IROC-Z, 5.7, auto, 3.27, leather, !cat, Holley fpr, K&N'S, SLP 1-3/4" Jet-Hot coated headers, SLP .218/.224 .495/.502 cam, Comp 1.5 roller tip rockers, $uperPITAram, Edelbrock lower intake, Holley 52mm tb, Dynomax\Flowmaster catback. Coming Soon(?)- Fasttrack/Accell DFI

1989 Pontiac 20th Anniversary Turbo Trans Am - 161,000 miles, !cat, 9" K&N