i know the stock iroc offset is i believe 0 in the front and +16mm in the back, so what do I need to do to put 4th gen wheels on?
I want to get the Y2k vette wheels and they make a +38, and +46 offset i believe...would like to do 17x9 in the back and 17x either 8 or 8.5 in the front....

 

Well, according to the Article in the Tech Central portion of the website here, it says you need to get 2.5" spacer hubs that you cen get from Vette Brakes in Tampa, Florida.

 

yea i know but i dont have any info on how much those spacer hubs are and a link or number to vette brakes...couldnt find it thru a search engine

 

Ummm...
www.vettebrakes.com

Or, for the same thing, just a little cheaper:
www.skulte.com

 

i have 65mm fronts and i will be trying a 2.25 to start and measure from there although they say that i'll need something around 2.75.

rears are 58mm and 2" adapters

so you shouldn't need large ones, check the charts. who are you looking to purchase them through as the only ones i've seen with that low of offset aren't from very good companies.