10 Bolt 70 Chevelle- Weld RT-S 18x10 Backspacing

[Shiner]

Originally Posted by Vince@Meanstreets

So a 15x8 and a 5.5 BS will actually take more due to tire bulge. Im assuming you are running a 255 tire? 255 on an 8 is 3/8" average. The actual back space available would be 5 3/4" taking the tire bulge into account.

On an 18 or 17 wheel the tire bulge is less.

I would measure what you have then subract an 1" min for articulation room. For a 305 or 315 on a 10" wide you will need 12" of space. Average 70 Chevelle wheel tub is 14-14 1/2" wide. 1/2" to the outer and 1 1/2" to the inner should do.

Jack up the back and pull the wheels. Let see what you have?

Outer: 1"
Inner: 2"

Section Width 11"

Weld recommended I go with a 6.1 and run .25" spacers if I need to.