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.

 

No, 85-88 is one style, 89 is another, and 90-92 is the third. But the only difference between 89 and 90-92 is the hole for the MAP sensor bracket on the 90-92's. Otherwise they're identical.

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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=-

 

Like Kevin said, you want to stick with a 90-92 model, since it has the MAP hole(boss), designated by #3 in the upper pic. You need this for your speed density setup.



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1989 IROC-Z 5.7L

 

OK thanks bros