The Big EZ heads made it two seasons before they developed leaks in multiple intake ports. So we're looking at different options. Looks like the best bet is to step up to a set of 440-1 castings with the 345cc porting package. We'll have the heads cut to the same 74 cc combustion chamber so the CR stays the same. Hopefully valve to piston stays the same but that will need to be checked. Hopefully the valves, springs, rocker arms, etc. all swap over from the Big EZ heads to the -1 heads. As far as I can tell everything will swap over, but I could be overlooking something.