Man, that is just what I could use. Is that the best picture you got? Can you send me the original 1:1 picture? My sis does professional drafting and can probably dimension these and get a very close full size hard copy. all I need to know is one critical dimension. How do they work? Looks like you put these in your valve guide and grind to make them flush fit into the port, and then go on to the next orientation? Too bad they are no longer in production. So are 308 castings better than 360's for a .284/484 type cam? I can get a pair cheap, but already have some late 360 LA style heads.