Sport Side

iTrader: (6)

No, everything was made up in that example...LOL, Don't follow it for its data. The main point is that a given intake lobe needs so much exhaust to work within a certain RPM range.
When you have too much exhaust, idle and low speed cruising may suffer as well as power is pushed higher in the RPM range as my example tries to show.
Flyer could run 2'' exhaust tubing and his idle would improve just like when he closes the cut-outs... (Another example)

Flyer

iTrader: (1)

I understand the effects, but what's the cause?

LS1TRUCKGUY

iTrader: (7)

So A Smaller Intake And Exhaust Duration Will Have A Low End Powerband? Where Does Lift Come Into Effect?

Flyer

iTrader: (1)

Good question ... what role does lift play on a cam besides the obvious it lets in more air by opening the valve further.

LS1TRUCKGUY

iTrader: (7)

Anybody Have Some Input On This Subject? Please?

TurboGibbs

iTrader: (6)

Lift has basically no effect on cam manerism or power band. You just get less valve shrouding of the hole with the more lift which equal more air flow. Several mechanical interferences and reliability issues is what limits lift.

LS1TRUCKGUY

iTrader: (7)

Would It Be Possible To Run A Small Duration High Lift Cam And Get Good Power From It As You Would A Big Duration And Smaller Lift Cam? so a big duration and low lift cam is more reliable? are you talking piston to valve clearance?

Sport Side

iTrader: (6)

It's very much possible. Reducing seat-seat time and increasing the ramp rate of the intake lobe works great. Lift is a by-product of the lobe profile and ramp rates in most scenarios.
A faster ramp puts the valve where it needs to be quickly. The 5.3L head flows 225CFM from .500'' valve lift to .650''. Get it their fast, and hold it their for as long as possible.
This works great for 'big' power and decent drivability. For a given LSA, less seat-seat timing means less overlap.

treyZ28

just remember you'll be beating on the valve and valvespring much harder- not to mention the lifter.

This is the reason why solid rollers make so much more power. Cam profile

LS1TRUCKGUY

iTrader: (7)

Thanks Sportside, That Makes Sense. So, In general, Small Duration And And High Lift Will Have Better Driveability Than A Big Duration Low Lift Cam, Right?