Originally Posted by Dynomite

No....unless someone else mixed L98 Air Boxes....but what is interesting....I have another 1990 (number 72) that is identical in terms of the Air Box Connection to the Air Box connection shown on 1990 number 3032. And.......that Connection on Air Box of number 72 had a make shift cap on it with no hose to the Air Valve....which is what started all this for me as I figured the hose was missing on number 72.

I do not recall such an Air Box connection on my L98 cars but will check.

Apologize to chgc267 for taking this thread in this direction but maybe we all can learn some things about abnormalities of the first 1990 ZR-1s. It prolly was a learning experience by GM. Some changes were obviously made in the 1991s regarding the charcoal Canister, Plenum, Injector Housings, Heads as we already are aware of.

It is also interesting chgc267 ZR-1 is one of the last ZR-1s off that assembly line in 1990 (number 3025).
A Very Nice LT5 to be sure

Originally Posted by chgc267

I looked on Marc's web site and w/ 4:10 gears I should turn 2,000 rpm in 6th @ 75mph...Which is what it does now. The previous owner mentioned to me that it pulled better than any other ZR-1's. He said he never changed them and assumed the car had the stock gears?