[A26B]

I'm a little confused, but nothing out of the ordinary for an old fart.

1. 90 IH's can be modified to work with 91~95 heads by drilling out the washer to 3/4" or removing it entirely. other than that, they are identical to 91~92 IH's.

2. 91~92 IH's can fit onto 93~95 heads without modification. Only need to remove lwr o-ring on the primary injectors & insure o-ring is in the IH for the primary injector.

Question: What are you thinking about exchanging? 375 Hp 90~92 IH's for 405 Hp 93~95 IH's? Remember, the 90 IH's can be easily modified to the same configuration as the 91~92 IH's.

Question: Are you saying the 90~92 IH's in stock condition have 34 mm ports compared to 36 mm ports on the 93~95 IH's.... or the other way around?

I guess on exchange that puts me in alittle bind as then I am stuck with older models and not many cars can use those...hmmmmm

From this last post, it sounds like you are exchanging the opposite direction, your 93~95 IH's for customers 90~92 IH's.