The article referenced earlier in this thread would probably be Steve Dulcich's supposed-to-be-4-but only-did-three part series on porting BBM heads. It showed exactly how putting the larger 2.14/1.81 combo in with a standard 3-angle valve job really sucked a$$ w/o doing at least the DC/MP port-template job on them. Something a number of Us know, but seems to not get the attn. it really deserves................