Ok I am looking to do the ls1 upgrade on the front and lt1 on the rear of my 91. My wheels are 17" True Forged Mach 5's (same as iForged Aeros) but mine have a hidden valve stem which basically is a lip behind the spokes that has the valve stem in it. These are also 4th gen spec wheels which require a 2" adapter.

I picked up my ls1 rotors today and set them up behind the wheels. I about have 1.75" of clearance from the valve stem lip to the edge of the rotor. I'm starting to doubt that this is enough clearance for caliper clearance. However, I am not sure how the adapter will position the wheel in relation to the caliper.

Here's the pics:







Better pics can be taken but my iPhone is all I had right now. Does this keep me from running these brakes?

 

really cant see the valve stem in that pic, so i have no idea.

 

There isn't one on the wheels yet. I am mainly concerned about the clearance of that lip. For valve stems I think I am going to get a set of flush mount valve stems from Gorilla so they shouldn't be in the way.

 

you shouldnt have clearance issues to the wheel hoop with the calipers, they sit pretty tight to the rotor.