Smoking engine

[Chris KC]

Gary, just out of interest what radius were your cam followers ground to (old vs new)?

I got these off Tony Betts, I think the radius is as described in the William's Austin Seven Specials book, so, would be 3/4" (from standard of 3/8"), the tappet guides were cut down to suit, took about 20 minutes to remove, cut & re-fit each one!

I only ask because my 'received wisdom' is that standard cam follower radius generally gives better bottom-end torque. Though it's possible the general improvement in performance through flattening the radii offsets this?