I picked up a used set of these runners for a good price not realizing that there were 2 different kinds made. I believe these were from a 1987 Iroc and I have a 1990 LB9.My next generation catalogue lists 2 types of these TPI runners 85-88 and 89-92. Does anyone know the difference? Actually Slp and Edelbrock also list different runners for these same years. Its not a speed density issue because 1989 had maf.Damn I hope I can use these.


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1990 Iroc convertible,305 tpi,Black with black leather interior,lowered,Taylor 8mm wires,K&N's,gutted airbox

 

You can use them, I don't think you will have any problems. There may be a hole in the drivers side runner for the cold start injector, but that shouldn't cause any problems. I was using the 1990+ runners on my 87 camaro for a while, I don't need the cold start injector in california.

 

To use 85-88 runners on an 89-92 car, you'll need to plug up the driver's side small tube with silicon, to prevent vacuum leaks. The difference between 85-88 and 89-92 is the cold start injector. 89-92 doesnt have it.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
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