Long story -

But I am looking for a copy of the 1986 377-447-503 owners manual

I am tryng to determine the correct compression ratio for a 377UL

I have the 1990 owners manual, and the 92 and 94 revisions, which list the 377 at compression ratio as 11.6 to 1

A well known (but will remain unnamed) site says something signifiantly lower

I am trying to determine if there are really two ratios - or if one site is in error

There is an earlier 1986 version of the manual available online. But it is only a partial copy - the technical data pages are not there.

Any old timers out there have a copy of the 1986 manual - or even a later revision prior to my 1990 version?

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