Thanks for the replies.
I didn't realy have roller rockers in mind (due to the cost amoung other things), and yes also thought it would be overkill for this motor and its
application.
I was instead musing about whether you could easliy change the ratio and still run a flat tappet cam. Sorry, I probably should have specified that.
I am aiming to build a mild motor, but a well thought out one (hence the questions).
Thanks again,
Dougal