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Porting TPI plenum and runners

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Old Jun 7, 2006 | 08:12 PM
  #1  
Don 79 TA's Avatar
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From: Long Island NY
Car: Hers: 88 Formula 350
Engine: TPI
Transmission: Auto
Axle/Gears: 10 bolt Posi
Porting TPI plenum and runners

is there any information on porting/port matching the TPI intake setup?
i tried searching didn't see anything photo wise or instructions wise

can it be done with a dremel?
or would i need an air tool for it?

i'm just looking to make what ever minor improvements i can since i am swapping the heads, figured good time to tweak it

since i'm staying somewhat relatively stock, i don't see the need to go with something like the edelbrock intake/runner kit
or aftermarket runners and such, unless they really add a benefit

open to ideas

basically swapping heads and adding shorty headers
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Old Jun 7, 2006 | 08:29 PM
  #2  
phoenix305's Avatar
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Joined: Mar 2004
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From: Clearfield,Utah
Car: 1987 IROC, 1989 IROC
Engine: built 305, stock 305 tpi
Transmission: Corvette 700r4, t-5
Axle/Gears: 4.10 posi, 3.08 posi
uhh if you're doing after market heads i think you would get a pretty good gain from aftermarket runners and base.
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Old Jun 7, 2006 | 08:39 PM
  #3  
skidude's Avatar
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From: North Carolina
Car: 1987 Pontiac Trans Am GTA
Engine: 5.7 TPI, L98
Transmission: 700R4
Axle/Gears: 3.42:1
just heads?

Just my

There's no way I would go through the trouble of swapping heads and headers and not install an aftermarket base & runners.

Good luck with your mods.
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Old Jun 7, 2006 | 08:42 PM
  #4  
1989GTATransAm's Avatar
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
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Old Jun 8, 2006 | 09:30 AM
  #5  
Don 79 TA's Avatar
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Joined: Apr 2005
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From: Long Island NY
Car: Hers: 88 Formula 350
Engine: TPI
Transmission: Auto
Axle/Gears: 10 bolt Posi
i figured since i am using the stock cam, and very mild heads, then the stock intake/plenum would be fine, even if i went with a real mild cam

trying to use what i have

i've heard the stock tpi setup, is good for 350-400 hp, especially if it's tweaked out

now if it's beneficial to use the edlebrock one, then i would
wasn't sure if it was warranted on the setup, plus trying to stay away from getting extremly involved with ecm changes
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Old Jun 8, 2006 | 11:54 AM
  #6  
D's89IROCZ's Avatar
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Joined: Jan 2003
Posts: 1,931
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From: Ontario, Canada
Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
Transmission: T-5 World Class
Mine is ported and siamesed . It's 4"deep . Some have gone farther .
Here is some pics


Here is the plenum ...also shows how much bigger the new runners are .
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