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Was it just rebuilt or was it like 30,000 miles ago? Did you have a buddy rebuild it for you, a shop or bought it from some where? How much compression do you have? First make sure the cylinder head has been properly bolted down. Next remove the spark plugs take some 80 or 90 weight oil and put about a tablespoon in each cylinder. Then do another compression test if the compression comes up it is most likely the piston rings. If the compression stays down it is most likely the valves.

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17y ago

What else can I help you with?