im building the top end and have decided mostly what to buy for valvetrain parts, im a little lost on valves... i was wondering if a bigger valve is necisary on a good pnped head? i was told that you cant run much bigger valves with a high duration cam but im using gsr cams with my boost setup for now, and was wondering if i did larger valves while i was doing all this, will it put me in a corner later on down the road, this head will be boosted with no n/a plans in the future.thanx