Re: early U20 head

["John F Sandhoff" <sandhoff@csus.edu>]

Steve noticed:
> Most U20 heads have threaded plugs above the exhaust ports...
> But on my U.S. U20 engine #001xx, the area above the exhaust port
> has no threaded hole at all.

67.5 U-20's did not have an air injection (thermactor) setup. That's one
way to see if a 67.5 has had an engine (or at least head) transplant.
In the US, 68+ were required to have the pump and plumbing. I don't
know about 68+ in other countries.

-- John
     John F Sandhoff   sandhoff@csus.edu   Sacramento, CA