E70-15 were 26.73" tall and F70-15 were 26.51" so those should not have made an impact unless you meant to say you used an F60-15 on the front? The FR60 is wider but only measure 26.10" in overall height so I'm hoping that 1/2" in height differential helps with the turning radius being that the tread width is 1.15" wider on each side. Section width is just under an inch wider.
If not then I'll have a spare set for the rear and will run something else up front.
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I like solid lifter cars, big cams and cars w/ 3 pedals in them. 
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