Recently I have been talking to some head work and cam specialists, kennelly cams here in christchurch (run by the man who used to desgin cam profiles for kelfords) after leaving a complete head with him for a day he says he should be able to regrind our factory cams to an advertised duration @ 0.1mm lift of around 264 degrees with in the relm of 10.5m of lift for around the $600 mark.
this seems fantastic to me and alot cheaper then buying billet "HKS" grinds which are as far as i have seen 272 duration but measured at 0 lift, and the most lift I have seen on aftermarket cams if .343" or aproxx 8.5mm
Along with this I Have compared 4g63t valve springs to 6A13TT ones..... They FIT !! the only issue i can see so far is i think the valve stem diameter in the 6A13 is narower then the 4G63T, however it is the same as 4G93T
when i can get my hands on a valve spring compressor i will test if 4g63T retainers and collets fit if not i will test the 4G93T ones. this could open a door to cheaper cam and valve train modifications.

folowing if the above testing for fitment of collets and retainers is sucessful, this could be a possible EOI for anyone who is intrested in a group buy on evo valve springs and cam regrinds. I myself and possibly carl could be intrested in doing this some time after the christmas period, or febuary time frame (provided suitable retainers can be found) the valve springs will have to be bought in lots of 3 between 2 people as 3x16 = 2x24 or we will be left with 8 springs left over which no-one can use.

I will update with photos after I get my eager hands onto a Valve spring compressor