50fanatic

What do you mean by that they float after 5300 rpm? My AOD doesn't go that far, so will I have to worry about that if I install them?[sm=insomnia.gif]

50fanatic

What do you mean by that they float after 5300 rpm? My AOD doesn't go that far, so will I have to worry about that if I install them?[sm=insomnia.gif]

HACKGT350

adding a different roller rocker ratio will not change your duration. yes duration starts at .050 lift. 1.7 1.6 rockers will not change when the valve starts to lift it changes total valve lift. when the valve starts to lift and ends has nothing to do with the rocker ratio just changes valve lift that is all. go read some books

redpony88

what does that mean?

Slo5oh

yes it does not change the actual duration on the cam, obviously.Though it does in essance change duration though, for reasons previously stated.

HACKGT350

valve float

redpony88

yea i thought about it a little more later. but how would the lifters get passed up by the lobes? valve floats been something thats bothered me cause i've never quite understood how it happens. but like you've said before why even rev a stock 5.0 that high power drops off around 4500

HACKGT350

the valve springs arent strong enough to push the valves back into their seats when moving that fast and basically stays open "floating"

redpony88

ok, got it. so in other words if you get better rocker arms etc get stiffer springs in addition to avoid float

HACKGT350

yup you need better springs to hold up to the higher lift and increased rpm's