from what ive measured it seems to have had a slight skim also.
while cleaning it up i found some markings and wondered if this could be a genuine SWIFTUNE head. The bloke who i got it off, never said anything about which company did the tuning parts, but he did say that it had sent it to have alot of work done on it. This was also a turbocharged engine. The head also has been skimmed on top... is this for the roller tips, this head seems wierd
The plot thickens.......
Here is a pic, showing the SWIFTUNE stamp and 20 5 (but no decimal point present)