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Re: Freshly rebuilt 350 burning oil and tappet noise.
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There is a loud banging along with the tapping.
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I'm not an engine builder but that sounds like major mechanical failure to me.
If you were to take out all the spark plugs and crank it over with a compression gage held or screwed in one cylinder at a time (three or so revolutions each time) you could determine if there is something like a thrown rod,bent valve etc.
Take off the valve covers and see if all valves are working properly.
Check the oil for metal shavings.
Then report back to the builder and see what he says. I assume it is still under warranty.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.
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