Would I gain much by fitting these?

[peaktorque]

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&am...

Apart from the better porting, is there much improvement of these heads over my standard 3.5 Range Rover heads?

I could save myself a few quid and improve the porting on my current heads (with the aid of a 'rotating abrasive device')
right?

[Roger McLittriss]

At a quick glance they don't seem to have much bigger ports than standard heads.

[peaktorque]

Roger McLittriss said:

At a quick glance they don't seem to have much bigger ports than standard heads.

They are definatly bigger than mine!