335/30-18 under my Cutlass...

[Chocolate Apocalypse]

...sweet, like candy.

Here it is...
http://i6.photobucket.com/albums/y23...s/DSC00390.jpg

Yep, its big...
http://i6.photobucket.com/albums/y23...s/DSC00391.jpg

Next to my 255/50-16....
http://i6.photobucket.com/albums/y23...s/DSC00402.jpg

Before....
http://i6.photobucket.com/albums/y23...s/DSC00393.jpg

After....
http://i6.photobucket.com/albums/y23...s/DSC00395.jpg

Few other shots....
http://i6.photobucket.com/albums/y23...s/DSC00396.jpg
http://i6.photobucket.com/albums/y23...s/DSC00410.jpg
http://i6.photobucket.com/albums/y23...s/DSC00411.jpg
http://i6.photobucket.com/albums/y23...s/DSC00414.jpg

At its closest point to the back of the wheelwell there is about 5/8" of an inch clearance. The lip of of the fender would need to be rolled but I think it will work. Especially with a little more clearance with a BFH. Hmmm. for what its worth, my buddies '69 Chevelle has about an inch less distance from the inner wheelwell to the outer edge of the fender compared to my Cutlass. Its the only measurement I could take and who knows if that translates into an inch more room or not, just thought I'd throw that tidbit in.

[Chocolate Apocalypse]

And as a side note, this tire as it sitsis just a hair wider (according to my tape measure) than 345/30-19s on a 12" rim (according to Michelin's tape measure).

[MrQuick]

Looks good. 5/8" is pretty good space...just be sure to measure real good and don't forget to allow for bulge on the rim.

[Chocolate Apocalypse]

Hopefully Michelin is right with their 13.6" section width on a 12" wide rim. Thats what I'm counting on. If they're on the money, I should be golden.