What is the stock TPI plenum port?
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Joined: Apr 2008
Posts: 2,342
Likes: 24
From: Dumfries, VA
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
What is the stock TPI plenum port?
Does anyone know the stock diameter of the throttle body and runner holes on a TPI plenum (out of an 85 305)?
Ive got the plenum ready to polish it and I want to see if it has been ported since the previous owner installed aluminum SLP runners and an aftermarket throttle body.
Also, I have seen cases where people have (successfully) ported their own plenums using a sharpie marker as the outline and a dremel tool for the porting. Will this work fine if done right? If this can be pulled off I'd much rather take the DIY route than send the plenum off to be ported.
Thanks.
Ive got the plenum ready to polish it and I want to see if it has been ported since the previous owner installed aluminum SLP runners and an aftermarket throttle body.
Also, I have seen cases where people have (successfully) ported their own plenums using a sharpie marker as the outline and a dremel tool for the porting. Will this work fine if done right? If this can be pulled off I'd much rather take the DIY route than send the plenum off to be ported.
Thanks.
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From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
Re: What is the stock TPI plenum port?
91/92 model:
TB larger part is around 2.03
TB smaller part around 1.875
runner ports around 1.59
TB larger part is around 2.03
TB smaller part around 1.875
runner ports around 1.59
Thread Starter
Supreme Member
Joined: Apr 2008
Posts: 2,342
Likes: 24
From: Dumfries, VA
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
Re: What is the stock TPI plenum port?
I meant the throttle body holes in the plenum not the actual throttle body.
Thanks for the runner diams though.
Thanks for the runner diams though.
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