I am running 119cc cast 781 heads that I extensively ported and polished/ gasket matched on the intake side and ported on the exhaust side I chose these heads for one reason affordability and the only gain I get with aluminum a is weight reduction and more chamber selection on a "nice head" they are in the future but for now it's a "budget build"
Today my new valve guide cutting bit came in so can run positive seals and double springs with 115 seat pressure and 325 open (if I remember correct) gotta give that .540 lift cam something to fight against now don't we?
Other then that no real "trade secrets" this is my first "high performance" build