Having bored out a set of CVK's, I agree with you, not worth it.

The 39mm FCR's are a better way to go but a real PITA to get set up correctly, plus expensive. But when they are set right, hang on!

I now have a set of the 45mm HSR's that really have some potential. As son as it gets warmer I will be getting those dialed in.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter