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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,575
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Sounds to me like valve noise from a loose valve or two, so recheck the valve clearances and be sure to make the adjustment at TDC on each cylinder. Yes, there is a procedure for adjusting multiple valves at certain points, but do it by the TDC method to be sure.
Next, it also sounds like it could be loose or blown exhaust gaskets. Check those.
While you have the valve covers off, check for broken head studs.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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