See these on yahoo http://www.microsofttranslator.com/BV.a ... e105208817

Worth it? or are standard heads easily modified?

They've gone unsold on yahoo for months.

There's no way of telling what spec they are without seeing them in person.

From what I can make out on the intake port it looks like its been reduced for more velocity and not opened up as per HRC manual , but then again there is not much point in opening it up if you don't have the cams for longer lift and the +3mm rods for longer stay to charge the cylinder. That could very much be a home made HRC jobby for someone that didn't have the full race kit but like Cam said you just wouldn't know until its in hand