Enlarging Plenum At Throttlebody
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Supreme Member
Joined: Oct 2001
Posts: 3,155
Likes: 2
From: Louisville, Ky
Car: 1991 Z28
Engine: 383
Transmission: T-5
Axle/Gears: 3.08 10 Bolt
Enlarging Plenum At Throttlebody
i have a 58mm tb for my stealthram and will need to enlarge the opening on the plenum for the 58mm to work properly. instead of enlarging the holes cant i just cut out the middle part of the plenum and make a large open oval??? will this hurt anything, i know it wont help but i want to make sure it wont hurt
Supreme Member
Joined: Jul 1999
Posts: 5,183
Likes: 42
From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
I ran one like that on my car with the stock TB, noticed absolutely no difference in performance or idle quality. I needed a spare while I poslished mine, still have it around somewhere I think, If I come across it, I'll post a pic.
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Joined: Sep 2003
Posts: 6,859
Likes: 14
From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Edit: You are correct the Superram comes with 58mm openings. My misread. 
Allen
Allen Last edited by 1989GTATransAm; May 23, 2005 at 09:10 PM.
Senior Member
Joined: Jun 2000
Posts: 998
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From: Tuscaloosa, AL
Car: 91Z, 91RS, '84 Jimmy
Engine: L98, 355, L98
Transmission: 700R, T56, 700R4
Funny....my 58mm BBK bolted onto my StealthRam and matched up almost perfectly. I had to trim the Fel-Pro TB gasket out to match the bore though.
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