Picked up an old Hobart G300 welder with a Chrysler engine. It's a 170 cu. in. slant six and I'm only getting 40 psi on each cylinder when I check the compression. I know it's only supposed to be an 8.5 to 1 comp ratio but doesn't 40 seem way low for even a 8.5/1 motor? I don't have any experience with these sixes so guess I could use some advice.

Thanks