Hi all. I am getting some (non standard) pipes made up for my s/a project. I read Q & A between dUTCH and trev , but just wished to confirm: Is there any difference in heights and exhaust port angles, between the alloy head and the iron head? My exhaust maker has an iron head s/a Flash to template from, but I am using an alloy head, so would like to know if this a straight forward template. Cheers, from Gav.