ya,i had a long talk with him in person the other day when i picked up a block.He said the valves will make a huge differance sence we are opening up the chambers so much.We just want to make sure the valve seat will be ok.We kinda mic'd it some and they look fine but you know how it goes when you are actually getting into it. CEDRIC is the man..he has done tons of motors for me and they always turn out GREAT ! One of the best machine guys around if you ask me..He has never built a motor for me but the machine work is always the best ..