I'm trying to verify what engine these pistons should fit. Bought them second hand and probably paid too much
I recenly bought these 4 big bore pistons. Supposedly Russ Collins 63mm (836cc) big bore pistons. The carton box doesn't identify RC or type number, only Honda CB750 STD. The inside of the pistons do show RC initials casted in.
Verifying the valve space on the top of piston, they appear to be rather F1 than F2 valve angle. Also the it appears that the top of piston is raised implying a higher compression. See pics.
ANy help appreciated.
--Edwin--
