[Roadsters] u20 cam timing

[shas1983 at netzero.net]

Does anyone have any experience with a u20 cam timing being off 1 tooth or
less? I have aligned the cam with TDC and counted chain links per the original
service manual. The engine cranks easily and runs pretty well at lower
rpms(under 3000), but seems to loose power and not readily want to climb to
higher rpms under load at speed (free revs easily). The odd thing is I had to
advance the distributor timing well past the std 16% to get the engine to run
well.

When I turn the engine over and stop it on #1 TDC per the crank the lobes of
the cam on #1 appear to be silghtly advanced past 10 and 2 and the intake vale
on #4 appears slighlty compressed more than #4 exhaust. It looks like they are
advanced at most less than 1 full tooth (15% on 24 tooth sprocket), so I am
wondering if the combination of a resurfaced head and cam tower shims could
have changed the chain length enough to account for this?

I have an adjustable cam sprocket that I can try (+- 6 degrees), but I was
wondering if others have seen this before I change the sprocket.  I would have
expected the engine to run far worse than it does, but I have just about ruled
everything else out. Seems good at lower rpms but just does not pull past 3000
rpms like it used to.

Jon Carlisle
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