I notice the LS2(budget 243) castings out now and comparing those with true LS6 heads with the lighter valves.

1. Would LS6 heads have a higher RPM ceiling than LS2s?

2. Would LS6 heads rev quicker than LS2s?

3. Do the lighter valves of an LS6 head allow for using springs with less open/closed pressure than if using LS2 valves? Cam lift being equal. Well thinking of a TR OMC or similar custom.

4. Would titanium retainers in the LS2 sufficiently reduce valvetrain weight so that the the LS2 responses to Questions 1,2,3 would be different?

Thanks.