Heads?
Could the Pistons be 7.6 on the Domes?76cc is a TON.
As far as the Head ? With the Sock GM casting,I think its a Toss up?
Save a Little $$$ and look for a set of World Sportsman II Cast Iron Heads with a 200 Runner,they can be had in the 500-600 Dollar range?And will Out Perform Either of the GM Choices!
Later
G 8)