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John,
I'm in Millbury (near Worcester).
mca: Although its very hard to hear in the video of your rebuilt engine being broken in, I hear indications of the noises I heard in mine that concerned me. Maybe I'm being over cautious here. I heard a bit of a high pitched "tinging" that bothered me. Maybe I've thrown you all off by characterizing it as a "knocking."
Part of the problem is, and I know you will all find this very strange, I have never really heard what a 911 engine is *supposed* to sound like. Sure, I've heard a 911 whiz by me now and then, but this is my first 911. When I bought it, the engine was sitting in a snowbank beside the car (PO couldn't afford the rebuild the mechanic told him it needed and the mechanic wouldn't put the engine back in the car). That said, I have plenty of experience rebuilding motorcycle engines. I was actually impressed by the throatyness of the engine sound when I first started it up. It was only after I was listening to it closely after it had been running for a few minutes that I noticed this "tinging" coming from the right side of the engine. It is possible it is benign, but I would prefer to get to the bottom of it as I see no reason why the right side of the engine should not be as quiet as the left side.
When I took the valve covers off lastnight and re-checked the valve/rocker clearances I noticed that cyl #5 was a bit tight and it seemed to be easier to push those valves down. So, I want to pull the engine out and try to do a better assessment of this.
One more thing - I'm using the 964 grind for my cams (I think they have a bit higher valve lift).
Geoff
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