03sierraslt

iTrader: (22)

Lower LSA brings the power down, raising the LSA raises the curve. A 117lsa cam will make power at a higher RPM then a 112lsa. I agree with what you are saying as far as higher LSA (Less overlap) having a positive effect on mileage but it will also take away from the bottom end some. Something along the lines of a 115-116 is kind of a happy medium in my opinion.

TXSZ66AVLANCHE

iTrader: (7)

I disagree with your opinion that a higher LSA will make power at a higher rpm...but do agree that a happy medium of duration, lift, LSA will have a positive effect on MPH.

TurboBerserker

iTrader: (1)

A higher lsa will broaden the powerband but also move torque up in the rpm range, while reducing max torque.

A lower lsa will narrow the powerband and move torque lower in the rpm range while increasing max torque.

TXSZ66AVLANCHE

iTrader: (7)

So why do u need a high stall converter with a (example) 224/227 .600/.610 112 lsa cam?? Based on the assumption that it will make more torque down low a high Stallman should not be needed.

TurboBerserker

iTrader: (1)

You missed the part about the narrow powerband.

Where the torque is in the rpm band is relative to the duration (and the cubes).

03sierraslt

iTrader: (22)

Disagree you may, however take a gander at this link. It explains LSA effects on the torque curve.

Technical Specs & Information

TurboBerserker

iTrader: (1)

This might also help (local version of that Comp chart from before Comp put it up plus a whole lot more).

spent21

iTrader: (3)

because a 224 112 lsa in a small cube, heavy truck needs a lot of torque to get moving, and since the power/torque curve has shifted from stock, a looser converter is needed to get the rpm to the point the engine is making power.

As for the OP, I have a 216/223 on a stock converter / 5.3 getting 18.5 if I'm lucky... of course, if I would back off of 80 mph, it would probably get a little better.

03sierraslt

iTrader: (22)

I dont remember the exact specs but these are close for comparison reasons.

Stock cam- 192/198 .476/.482 116lsa

If you only changed the LSA and left the other specs the same, a lower LSA would shift the torque curve down. Now in your question, yes the LSA is lower however you are also comparing a cam that has over 30 degrees more duration then stock. Adding 30 degrees duration will shift your torque curve up, a high intake duration will especially move the curve up.

Also as you know cubes eat up a cam so to speak, a big cam in a 4.8 is a somewhat mild cam in a 5.3 and tame in a 6.0

Ferocity02

iTrader: (59)

FWIW, I went from a stock 5.3 cam (114 LSA) to an LS1 cam (116 LSA) and lost quite a bit of torque down low, but there was a good increase in power up top.

And 18mpg highway ain't too shabby for a 6.0L. My 5.3L is averaging 16mpg