see what John Renwick has taken that vincent engine out to ....... 1650CC !!! amazing, and still using standard bottom end bearings albeit with extra bracing inside the casings ....
Do you remember Brian Chapman and his vincent comet 'mighty mouse' ? .... bloody fantastic, he used to blow away machines 3 times the size on drag strips,
i remember seeing him at snetterton (when they ran drag racing on the norwich straight), and chatting to him in the pits, and him saying the bottom end was completely standard and had been for 3 years.... wonderful