Speed master LA heads

Here's some reality I've had my set on for approaching5 years probably about 5000 Street miles . my camshaft is 241 at 50 and 500 lift hydraulic flat tap , I often turn my 340 past 6500 RPMs my head's were assembled by speedmaster with no problems valves are nice springs are decent but I will be changing them out in the near future with my cam change.