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Another suggestion: use the timing light to set the total advace to 28 degrees at 4000 RPM (I use 30 on my modified engine, but most sources, including TRF, say 28) If it pinks, back off a degree or two. You now have the best running advance instead of the best idle advance, which IMHO is preferred.
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I pretty much agree.
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You can go thru all the math, timing lights, dwell angles you like... but in the end you will drive the car and it will tell you when you get it right.
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Geo,
You may get away with this method on an old, low compression engine, with conservative cam timing.
On higher compression engines, & especially with more radical cam timing, you can easily get into high rpm detonation that likely won't be heard. It can result in severe damage. You won't know or hear it until too late.
With such an engine, it becomes very important to not exceed a given maximum timing advance at higher rpm. This might be 28 - 34 degrees or such, depending on compression ratio, fuel octane, cam characteristics, etc. There is no way to verify this high rpm timing limit by setting static timing, idle timing, or setting it by feel or sound. You must set with maximum static plus centrifugal advance fully in at the higher rpm & let the idle timing fall where it may.
A few degrees under advance will reduce power very little. A few degrees over advance can create a disaster.
D