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Well, I'm glad I bought 255's. They're in there alright, but that don't fit.

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The wheel width is the issue with a 275/60r15.
They fit and clear fine on a 7 inch wheel with 4.25 backspacing.

If they were street tires I'd run the 275's on 7 inch wheel, but as has been commented the Pro drag radials are even wider.
On them it squeezed the sidewalls inn too much for me.

My current street tires are 255/60r15's (redlines).
When I get replacements for them I'm going to go to the 275/60r15 redlines and they'll be run on the 7 inch wheels.
At the rate I've been smoking them off it will be this winter or sooner.


The shape of the wheelwell on a 66/67 B-Body (except Charger) is what creates the clearance problems.
The Charger wheel well opening is cut higher, more of the tire is exposed.

From the pics posted 65's are cut higher too.
The rear end width is the same from 65 to 67 on B-Bodies.