On Thu, 20 May 1999, Heglund, Davis (MN17) wrote:
> Listers: Checking the compression on my '69 GT6+ yesterday, ranged from
> 135 to 175psi. What should it be? I have two manuals, but couldn't find it
> listed in either. TIA
I don't have books handy, but the 135 figures sounds to be "in the
ballpark." Are any lower than that? The 175 might indicate some carbon
build-up? For a stock GT6+ engine, I'd think 175 would be rather too high
a number. Rule of thumb seems to be that compression figures should be
ideally within around 5% (maybe 10% at most) among all six cylinders.
--Andy
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