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oil leak at cyl head after rebuild

Engine

Model: 911SC, Year:1978, Mileage:117100, Type of use:Street use only
After a top end rebuild and about 1500 miles, I have oil leaking between the top of the cylinder and the head on 3 cylinders. The oil just wets the surface about 1-2 inches wide. The car starts very well, slight puff of smoke on start. I have noticed oily residue on the rear of the car, freckle sized spots on license plate. Should I be concerned? The top end rebuild included new rings, valve guides, rockers where necessary, reground cam, timing chain, guides - all done by experienced shop.

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