[Tomma]

I've just picked up some Version 8 replacement cylinder heads which have Zero cracks in them, I am looking at upgrading the Cams in these so am wondering the following:-

If I upgrade the cams do I or should I get new or uprated valves, springs, retainers?

If yes then what if any work needs to be done to the cylinder heads?

I am not setting my sights on any specific power figures but thought i'd read somewhere that if you start pushing more than 500-550 bhp then the standard cams become a limiting factor??

thanks in advance