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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,627
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I've posed the question on this forum before as to whether valve clearances increase when the engine is hot, and the response from several of the builders and racers is that they increase. I know from setting my valves with several different methods, that it doesn't take much increase in valve clearance to get valve noise. If you are greater than about .005 cold clearance, you will get valve noise when it's warm. Unless gets louder than what I heard on the video, it sounds normal.
BTW, several other guys here and I set valves the easiest way possible--no screwing around with feeler gaugers, snap-gaps, Stomski tools, etc. Instead, we screw the adjuster down to contact, then back it off 1/10 turn. That gives .004" clearance. 1/8 turn gives .005" clearance, if you want to be on the safe side, but it does increase valve noise.
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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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