Why did 90-92 plenums "3rd" air passageget 86'ed?
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Joined: Jan 2001
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From: Bakersfield,ca,us
Car: 91 z82
Engine: 5.0
Transmission: pro-built 700r4: 2400 stall
Why did 90-92 plenums "3rd" air passageget 86'ed?
I was courious the first time I saw that
Btw I'm talking about the Throttle body mounting surface if there is any confusion
Is this better worse than older models ?
Why did they do that ?
Thanks
Btw I'm talking about the Throttle body mounting surface if there is any confusion
Is this better worse than older models ?
Why did they do that ?
Thanks
Joined: Jul 1999
Posts: 10,950
Likes: 27
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
85-88 is one style, and 89-92 is the other style. I dunno why it was changed, but the later style funnels the IAC air to the throttle body blades, while the 85-88 uses the triangle on the front of the plenum.
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