I would like to install some larger valves im my head during my buildup. I currently have the stock 31mm intake and 28mm exhaust valves. i would like to go .5mm bigger or if possible 1mm. My concern are what needs to be done. Will the stock valve seats be ok. I have heard that they will be fine for .5mm but not 1mm oversized. Im sure if I have to put new seats in that its not going to be cheap. I want to do something being that i at least need to get new seats cut but if it is gobs of cash i may pass. My project is getting way too far over budget. Would I be alright with jsut going .5mm over and using the stock seats and opening up the bowls a little further. BTW this is an LS head