Ah - I wondered how they got more lift from a reprofile - cutting the base circle means you can shim up the clearance underneath and then when the valve gets up on the cam its increased its lift by the depth of the shims
. Thanks for the explanation Sixnut!
When I (eventually) get my Warrior engine built up I will need a pair of fast road cams, although I have a pair of 105s to be going on with...
Lauren