'90 Plenum work on '89
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
The only difference is the 1990 plenum will have an extra vacuum hole and screw hole on the side for the MAP sensor. Plug that and it'll be fine.
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Joined: Oct 2001
Posts: 425
Likes: 0
From: Central Jersey
Car: 1992 Z28
Engine: Stock L98 with bolt ons.
Transmission: Stock rebuilt tranny with 2k stall and cooler.
I have a spare 89 plenum when I really wanted a spare 90-92. If it's in good condition, stock and unported let me know and maybe we can work out a swap? The info you got was right the money tho, for me Id have to relocate my MAP sensor or find a proper way to reattach it to the plenum. I didn't realize this when I bought the part and it's been in my closet of spare parts ever since.
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Joined: Dec 1999
Posts: 138
Likes: 1
From: Chicago, IL
Car: 1989 Trans AM GTA
Engine: 5.7 TPI - Stock
Transmission: 700R4
ThirdGenZ28 92, if you are looking to sell your '89 Plenum, I could be interested in purchasing it from you. The 1990 plenum I was going to see was unfortunately sold before I got there. Please e-mail me: powerbookem@yahoo.com for price. Thanks........Clyde
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