i use .395 web cam's and have for 15 years at least and i love them they have been in at least 5 different engine combo's of mine and they rock but you have to clearance the head, bucket bores and valve cover i think it is worth it.
1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE