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Check valve clearances. How long has it sat during your resto? The clearance might have been too tight and a little rust or carbon on the stem could be causing it to not close. There are millions of good diy videos on line and you might find one for your engine. But the bottom line is learning engine basics. Compression loss can indicate valve leaks, worn rings, blown head gasket, cracked head, loose head bolts. You’ve gotta learn if you don’t want to pay someone else. I turned 78 today and have been playing with engines for 70. Good luck.
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