I run them,ran the 200cc ports originally,on my 377ci clevo power would have been around 550hp or there abouts,it did show 124.5mph best @3650lb,building a 400+ cube world block clevor now,heads have been worked on,very happy with the bench numbers so far.
combo will have 12's comp,solid roller,and 1050-1150 carb,we are aiming for 680hp on pump fuel..
well lets just say 775-800 hp is what Im looking for .
Ive posted the info and pictures on several differnt sites. If anyone would like to see pictures e-mail me or call email@example.com