I am hoping someone can help me. I have a 1946 Panther 350cc sloper single. The bike was a straight line sprinter race bike. It is supercharged with a Marshall Rootes blower fed by a 2" S.U car on methanol. I am in need of a piston and valves. I understand the 350 Gold Star and the B-31 BSAs have a bore and stroke of 71 x 88 mm, the same as the Panther. What I need to know is if the wrist pin hole is the same size as the Panther's and if the height of the wrist pin is the same. The Panther wrist pin is .750", the distance from the top of the wrist pin hole to the top of the piston is .860". The piston is a flat top. A domed piston would be no problem as I can machine it to my needs. The valves are both 3.950 inches long with 1.370" dia heads.