As I shipping of these Toyota pro fab nascar headers to an Aussie fabricator . I thought to myself  . Looks like an easy adapt to yblock . Account the slip fit design . Easy reweld on the flanges .  These headers can be made shorter or longer . I would be interested doing some if there was an interest .   I also  a vendor at the PRI show in Indy  . Talked with a few high tech aluminum sand casting companys . For  reversible high flow .water pump and  cam cover .  These headers have 1 7/8ths primaries stepped to 2" all flowed , weigh less than 30 lbs   ,can put oval outlets for low clearance . I keep 10 sets in stock .    

Po ol Davie

Sparta , Tn.