polishing plenum (?)
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Joined: Jun 2003
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From: Portland, OR
Car: '86 Z28
Engine: LB9 (305 TPI)
Transmission: 700R4 w/kit
polishing plenum (?)
I was just wondering what the benefit of polishing the plenum is, how does it work? For those of you that have done it, have you noticed any difference? And if you have, was it worth the time? I was also wondering if anyone would care to estimate gains in hp/tq. I've read the tech article about polishing the plenum, and am thinking of doing it...
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From: Winston salem, NC
Car: 1987 1SICIROC.....1999 TransAm
Engine: 385 HSR.....LS1
Transmission: 700R4 with Midwest 3400 2.4str...M6
Axle/Gears: SLP Zexel Posi unit 3.42's...3.73's
Polishing the plenum is not for HP gains...its for appearance to give it a shinny chrome look.........your talkng about PORTING the plenum... I think?
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From: Grand Island, NY
Car: 1990 Formula
Engine: 305 TPI
Transmission: WC T5
Nooo He is talking about poishing it so all that air in the engine compartment just slips over the top of the engine.......to get that big HP gain! 
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