I think your all talking about the R3350 lads
And just for Yr rights benefit they were run around 0.4lb/hp/hr and for a low compression ratio engine that is what? LOP or ROP? please tell me, just in case I forgot something
MACH E,
The things you mention
it gaskets, go back to solid lifters, better valves and a better fuelling system e.g. throttle body injection, multi point CHT and EGT probes as standard
are all good improvement ideas. The valves I think are fine. It is more a matter of the valve guide material, and the head distorting affecting guide/seat geometry. Perhaps even rocker arm geometry. These are the things that break heads off valves usually.