67' GTO maximum wheel/tire sizes

[Nicks67GTO]

*DISCLAIMER* Im in no way suggesting this will work for you or your car. I'm just posting what I ended up going with to help people get in the ball park. My rear axle is not a stock Pontiac unit and I think its a bit different on the width.

Since this popped up and in case others end up searching this i'm going to post up what I ended up going with. I can say that the rear wheel wells are tight in the '67 GTO. Where Iv'e been told some Chevelles can get away with 10" wheels and wider tires Im positive I couldn't. There's no way I would have gotten 10" wheels back there and even 275's would have been do-able but tight.

I ended up with

-18x8 with a 5" BS and 245/45/18 Nitto555's in the front on a Kore3 C6 Z51 front brake kit. I have no clearance issues. The Kore3 Kit narrows the track width by .25" per side which I found is a MILE when talking fender to tire clearance with the taller 45 series tire. I tried them on for fun with my Stock D52 front brake kit before swapping and they hit the rear fenderwell opening. The Kore3 brake kit narrowed it up like it was supposed to and I have no clearance issues, as I suspected I wouldn't after the brake swap.

-18x9 on a 5.75" BS and 265/50/18 Nitto555's in the rear on an "LS1" conversion 2002 Camaro 12" Rear brake kit. I had to do a little massage with a BFH in a couple of the pinch points but I don't seem to have any rubbing or clearance issues that ill need to deal with, even with very hard corners and at full compression. I did end up going with a .25" Billet specialties spacer in the rear to get them spot on.

If anyone has questions let me know. Here is a pic of the car after I got done last fall. I still need to do a bit of work on the ride height and the car was filthy when I took the pic but oh well..... ill get that squared away this spring.