Benson -- I realise this is what you are saying, just go the whole hog off the bat. I'll price it up but its more the fact that I don't have access to suitable environment for an engine build nor do i have access to the tools. So I was 'hoping' to install this head for starters, then put the same head on a built block down the track in say 12 months, when it is more ... convenient.

TB - Yes - I am estimating increase of at least 10% top end from cams alone. I think the head work may net another 3-5%. I will be removing AC at minimum to reduce parasitic drag. Thinking of getting an electric water pump to remove the losses there as well. I don't think that is unreasonable .. ?

I am clear in what I want, how I go about it as another thing... I want a road registered track car.

Benson - I understand your point. The best way is without doubt going down that path and I would go that way if I didn't have circumstances playing against me and don't want to pay massive labour costs for the build ie do it myself. I am prepared to accept it'll likely cost more in the future as a result (albeit not a great deal, mainly tuning).

I understand everything said .. Its not only bang for buck, its bang for ease of installation / effect of modification at this stage.

Just spoke to a friend with DC2R - He had 139kW from Toda B setup (Built engine, 12.6:1) very very strong mid range. And after all that, he says '**** going NA just supercharge it' lol. So to end all of this the Head is something I should get in any case. I'll buy the head and bolt it to my motor with either stock cams or mild cams (Toda B or less) for the time being. I'll supercharge it down the track in which case a higher flowing head is benefical anyway..

Thanks for your help