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Leak down and compression tests will not show worn valve guides. Pull a spark plug out and see if it is coated with carbon from oil. I am curious about the check for valve guide wear the mechanic did, seems tough to check by wiggling the valves in the guides unless he removed the valve springs. Leaks on the left exhaust is most likely valve covers, unless one of the rocker shafts is loose.
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Ed
1973.5 T
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