Ok, here's what I'd like to know as I really don't have a clue
Is the cylinder head from an mk4 XR3i the same as an RS Turbo head?
I ask because I can buy a new head for my RS Turbo for a good price. But I have to be sure first if both heads are the same.
here are some pics of the head.

 

different valves i think, the turbo valves are filled with sodium i think

 

grimmerst is right, the heads the same, different cam cause of duration and the valves are sodium filled to cope with the heat

 

also the exhaust and inlet ports are reworked on the turbo head

 

Thanks guys. Now I know I don't have to bother buying it

 

rs heads arent very much secondhand if your desperate for one, i got mine for Ł10 in excellent condition

 

I could have sworn that only the S1 had reworked exhaust ports and sodium filled valves. Some first S2s might have had the sodium filled valves too, but generally these are not considered as of very good quality and often cause more trouble than what they are worth. I'd take that head any given day if the price is ok.

 

EFi heads are all the same. The MFi S2 rst head is the same as the MFi XR3i head. The S1 had the sodium valves, but that same port size and combustion camber shape as the 3i heads. HTH

 

The price for that new head is Ł340. Don't know if that's much or not.

 

It's a bit dear in my opinion especially as used CVH heads often are like new after cleaning unless the bearing surfaces or the lifter bores have been killed somehow.

 

Whats wrong with the rs head??

 

the head is still fine, but the engine has already done 233.000km (145000miles) so I want to have a spare engine if this one goes POP.