bsbllfit7

The intake valves are likely being blown open by the increased boost pressure as well as because of the way more aggressive lift the valves never fully rebound to normal position is my understanding.

dookgvr4

iTrader: (14)

Well I understand that, But will it really show up as a power loss when trying to run 30+lbs lik “op” was?

bsbllfit7

If the intake valves are opening and springs can't close a valve soon enough the pressure is not being sealed into the intake chamber and the exhaust valves are likely leaching power out as well.

dookgvr4

iTrader: (14)

Gotcha. Thank you.

CurseDSM

iTrader: (3)

Basically what was said above but with stock valve springs they will not hold the larger cam durations either. The springs will actually fail or have a chance at failing with the larger lift the after market cams will offer.