I was comparing some angles and intake sizes last night on my bench, 62t vs 61x.
It looks to me like the 62t will flow slightly MORE thru the intake tract
But the 61x isnt far behind, and in my opinion, the 61x offers more of a straight pathway into the cases
I know everyone here is all ghung ho on the 62t cases, but I really think that the 61x cases were simply given up on too early/easily.
61x cases can be bought for $60
62t cases cost more like $200+
carbs/intakes and reeds are cheaper for the 61x engines too.
I doubt on a well setup engine, that you would feel the $140 difference in power.