Sorta what I was trying to ascertain myself.....considering all the effort folks seem to apply toward finding the legendary Holy Grail closed port top ends for these saws...or at least the pistons. 'Course there are workarounds for the lack of an AM piston for the 51cc Rancher including cutting widows into a full-skirt piston or using a windowed piston and modifying the cylinder to essentially create the same porting as the Meteor kit, but in a 51cc config, of course.
Either way, and whatever ya wanna call it......,closed port, open port, or hybrid, the 46mm Meteor kit is clearly a superior solution to either of the original designs. I'm just surprised it hasn't been a more popular and more discussed solution for the 50 series Huskys. Also surprised someone hasn't done all the porting number comparisons, (or even the stock number comparisons for that matter) among all the variations of these top ends. Would be an interesting study.
I'd love to have a nicely ported one. Beyond my current skill set, but maybe one of these days I can afford to get one done.
Hell, I'm just happy I discovered they exist at all!