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I have a lightened flywheel in my Tudor that I use for touring. It is a "B" engine with a 6.0:1 head. I really like the lightened flywheel, I think it makes the car easier to drive and is more responsive when accelerating from a stop.
It still idles consistently at about 350 RPM with the spark retarded and I have even had it idle down to 290 and was still smooth.
With a lightened flywheel, you do not have as much weight hanging on the rear main which I think is a good thing.
Personally, I would lighten the flywheel on any engine I would build for my own Model A.
Again, there is a lot of opinion on this subject and this is just mine.
Chris W.