HELP! Dolmar cylinder difference

[Shane¹]

Anyone know when dolmar changed the 120 super, 120si, 6800 49mm cylinder. I noticed tonight that some have the tab to support the rings on the intake and others don't. Anyone have any idea what cylinder makes more power or if it matters?

 

[82f100swb]

From what I remember reading the 120SI makes more power than the Super, and the 6800 is essentilly the same as the SI.