i can tell you the connecting pipes are a bit too small.they should be exactly 63.5 thou larger!
talking from experience as all my cylinders are set up like that.
won't matter much as rotation speeds are much below rated.
9 will actually offer better longevity but not something you'll be able to prove in this application.
newer are aluminum and thread on the crank. but all full circle crank couplers where cast iron with pressed on stainless seal wear ring and are bolted to the crank with a taper fit .
the aftermarket made them out of alloy.
never seize is nice but any waterproof grease works .too much of it is just about right but don't blow out the shaft plugs.
exact alignment will slow spline wear too.
the funny thing is that decades ago weber and solex carbs sold drill bit sets for their carbs.plenty of mechanics used them with no ill effects for the longest of time.
holley always mentioned how their jets where reamed/flowed etc..etc.. etc.. blah blah blah but yet guys at the track where...
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