I'm running 15x8 Weld Prostars with 4.5" BS on a 68 hardtop. The tires are 28x11.5x15 Hoosier Quick Time Pros. they have a 11.2" section width,10" tread and are 28" tall. They fit without rubbing but if I had to do it again I'd probably go with 5" backspace since the outside of the tire is very close to the wheel opening on the quarter and there is at least 1" of extra clearence at the inner wheelwell.
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68 GTO,3860#
Stock Original 400/M-20 Muncie,3.55’s
13.86 @ 100
Old combo:
462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's.
1968 Pontiac GTO : 11.114 @ 120.130 MPH
New combo:
517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's
636HP/654TQ
1.452 10.603 @ 125.09
http://www.dragtimes.com/Pontiac-GTO...lip-31594.html
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