I want to run slicks on my car, and I will be replacing the rear end w/ 12 bolt and new gears so I can compensate for taller tires. What is the biggest size slicks I can fit under my car with factory springs, what about w/ 1" lowering springs?

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-=1987 Formula 350=-

Member Greater Cincinnati F-Body Association

i'm goign with 15x10 prostars with 26x 11.5s

I currently have 28x9 on mine and would probably go to 29x10.5 without any surgery. I have 15x10 rims with 5.5 backspace.

The height will all depend on what gear ratio you want to go with. Squeeze the tallest tire you can THEN calculate the best gear ratio to use. With a bit of work you should be able to squeeze at least a 30x10.5. The height would just fit and may need a bit of cutting or hammering and the 10.5 should be the same.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley