oliver 12 port gas heads all the same? cross flow? also

Are all the gas 12 port, 7 mains have the same heads? (310 Gas/283 gas/ 1850lp, 1800, etc)

any one still running diesel cross flow head? are they more trouble converting to gas? can a 12 port be made to flow as good?

I'm planing on running 4200 rpms
 

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