Advice on working my P90

[DeusEx]

Hey Guys,

 

I plan on shaving my P90 very soon, and after looking around ive decided taking 2mm off wll give me a good raise in compression. after speaking with the Brisbane Z god he advised me not to shim my cam towers as it will screw up my cam geometry. He told me how to then adjsut the timing gear to take up the slack on the timing chain, but im not that technical so it didnt make much sence to me.

 

But ive been reading some things on porting and polishing and this is where i am having my delema. Its already got a port match and polsh to the manifolds. So my question is;

 

Is it worth porting my intake and exhaust ports in pursuit of more HP?

Is it more advantageous to port one more than the other? (intake over exhaust for example)

Im not very technical when it comes to this, but how much should the ports be widened to? Or how much should they be made to flow. Keeping in mind im looking to spend $500 or so.....

 

Since changing my cam i have already lost alot of downlow torue in favour of more revs, and i really dont wanna loose alot more. Will porting take this away from me?

 

Sorry if this has all been posted before, i have read though a number of threads but had a few questions of my own.

 

Thanks