Grinding inside plenum?
Thread Starter
Joined: Mar 2007
Posts: 1,698
Likes: 3
From: NE Pennsylvania
Car: 85 Iroc-Z
Engine: 383 TPI Procharger D1SC
Transmission: TKO600
Axle/Gears: Strange S60 3.73
Grinding inside plenum?
I was reading an easy way to improve a small amount of air flow on a stock plenum is to grind down the "walls" in front of the holes for the IAC valve in the plenum. Can anything go wrong by grinding these walls down?
Senior Member
Joined: Aug 2005
Posts: 855
Likes: 0
From: California, Sacrameto
Car: 88 gta
Engine: 350 tpi
Transmission: 700r4
Re: Grinding inside plenum?
Nope, unless you grind a hole in the side or something. I noticed much crisper response after. And another 50 or so usable rpm. Also some of the holes for the runners were partially blocked by casting flash; I smoothed that down as well.
Junior Member
Joined: Nov 2005
Posts: 80
Likes: 0
From: Sweden Europe
Car: 89 IrocZ
Engine: 5.7
Transmission: TH700
Axle/Gears: 2.77
Re: Grinding inside plenum?
I have also removed the wall at the same time i siamesed the runner holes and installed SLP runners hogged them out and siamesed them up as far as i could down the the tubes.Did give me a couple of hundreds more rpm to work with that is my experience.
regards Mats
Senior Member
Joined: Dec 2001
Posts: 620
Likes: 0
From: El Paso, Texas
Car: 2000 Trans Am and a 85 Iroc-Z
Engine: The Mighty LS1& 305 just beat meTPI
Transmission: 4L60E and 700R4
Re: Grinding inside plenum?
I did the same, deff a good thing. You can't mess it up, hopefully. Good mod and it's free.
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Joined: Jun 2002
Posts: 6,819
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From: AR
Car: 1991 Camaro RS Vert
Engine: 350 S-TPI
Transmission: T5
Axle/Gears: GU5/G80/J65
Re: Grinding inside plenum?
I switched to an upper plenium that had this done before I got it. Noticed a little better response on the throttle. I hardly take my motor to peak rpm so I have no say-so in that.
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