My '55 1st GMC Suburban gets 12 to 14. 270, SM420 and 3.08 gears in the rear.

I know I have a fuel leak and have suspected that some tuning might get be a little better milleage but I'd be surprised if it ever got much better.


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...