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So the assumption has to be you have something else wrong. I once bought a P1800 with a "badly machined rebuilt engine". I was told irt was fully rebuilt, but knocked, so the guy was scared to run it for fear of doing damage. I figured it was shot anyhow so I might as well drive it, didn't realy care if it blew. Apart from the fact that it refused to blow up and ran abolutely sweet as.
Eventually I discovered it has a head bolt wedged between the sump and the crossmember, never figured out where it came from, the car had all its head bolts.
A few alternative suggestions, loose Dynamo, Dent in the rocker cover and a rocker is hitting it, chipped cam follower, failing oil pump drive (early versions do fail, loose rocker shaft...
Pete
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