theformula

I'm thinking of buying a plenum to polish and port so I dont have to not have my car for a week.

Are they exactly the same. With vacuum fittings..weatherpack connections....basically everything?

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91 Formula
305 TPI 5speed
1LE/G92/WS6
K&N, SLP airfoil, ported/polished plenum, March pulleys, TB coolant bypass,Crane AFPR(47psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires, fastchip, Bosch O2sensor, SLP headers & catback,3:73s w/Auburn posi,160* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

Scott 88 GTA

No, 85 - 89 are the same, and 90 - 92 are the same. The only difference is the 90 and later ones had the provision for the MAP sensor.

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Black 88 GTA L98
New engine is in!
ZZ4 bottom end, Edelbrock 6085 heads, LT4 HOT cam, GMPP 1.6 RR's, ported stock TPI, SLP 1 3/4" headers, no cat, Dynomax cat-back
E.T.F.A Member #11

Kevin91Z

iTrader: (1)

85-88, and 89-92. I replied to your other post in the history/restoration forum.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

MikeH

iTrader: (10)

The 90-92 plenums have a smoother radius inside,around the plenum to runner holes from the factory. The 85-88 plenums have alot of sharp edges inside. And the wall at the front is smaller on the 90-92 plenums.
I compared an 88 to my 90 and was surprised at the difference.

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Black 90 IROC, L98, A4, 323 gear. SuperRamed 406 in the works!

[This message has been edited by MikeH (edited January 12, 2001).]