hey guys im currently rebuilding a 3.5lt engine with all the good stuff but the company i have been talking to says that they dont think there is much they can do to strengthen the heads (as in fit bigger valves etc) does anyone know who i might be able to talk to about my issue around Newcastle, Sydney area thanks brendan

Remove the hotspots in the combustion chamber, ralliart spec valve springs and that's all. Should flow a fair amount of horsepower. When you say "all the good stuff," what do you mean?

hey guys im currently rebuilding a 3.5lt engine with all the good stuff but the company i have been talking to says that they dont think there is much they can do to strengthen the heads (as in fit bigger valves etc) does anyone know who i might be able to talk to about my issue around Newcastle, Sydney area thanks brendan ask lenda, he's a rep on this site, he found pistons for loud1 and his ralliart.... Forged and rod.. Pretty cheap.. Your heads can be done anywhere ;)

Remove the hotspots in the combustion chamber, ralliart spec valve springs and that's all.

Pretty much this, as well as getting the manifolds and heads port matched, having the inlet ports knife edged and cleaned up, and getting the exhaust ports polished.