Good stuff, Barney;
Just a couple of observations for the OP's benefit. The 3-main engines
reportedly revved up better because of less friction in the mains.
OTOH, the 3-main crank flexed quite a bit under load, hence the 5-main
was substituted to stiffen the crank.
When I built my last 5-main engine, I compared the weight of the short
valve lifter/long pushrod combo to the long lifter/short pushrod combo;
decided there wasn't all that much difference between them. I used the
long lifter/short pushrod combo on the theory that the short pushrods
would be stiffer; a good thing since I was using dual double valve
springs. A thing that moved me to this decision was that I had come by
a used 18V that didn't have a straight pushrod in it!
One could make a decent argument either way, I suppose.
CR
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