HP or torque ?

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Mar 25, 2014 | 07:03 PM

billymgb1000

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From: harrisville R.I

HP or torque ?

I have a 4.8 with a 5.3 crankshaft, 5.3 rods and what I'm wondering is what will I gain. If I use the 4.8 flattop to gain more compression what does that do. will I gain more torque or HP. Or do I gain both, thanks guys

Mar 26, 2014 | 04:59 PM

iliveonnitro

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Both as it's a displacement increase, though probably more torque.

Mar 26, 2014 | 05:12 PM

Cosmik de Bris

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From: Christchurch, New Zealand

Horsepower = RPM X Torque X conversion constant. Change one, you change the other.

Mar 26, 2014 | 05:29 PM

Darkman

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Quote:

Originally Posted by Cosmik de Bris

Horsepower = RPM X Torque X conversion constant. Change one, you change the other.

Not necessarily - if you increase the torque, but it occurs at a lower rpm, horsepower can remain the same or even decrease.

Mar 26, 2014 | 06:52 PM

COSPEED2

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There are too many factors to say that much but you will gain both. You are basically doing an 05+ 5.3 with (possibly) crappier heads. The 4.8 is really a turd.

Mar 26, 2014 | 07:06 PM

DREAMZ28

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Quote:

Originally Posted by Darkman

Not necessarily - if you increase the torque, but it occurs at a lower rpm, horsepower can remain the same or even decrease.

He means that a torque increase at a specific rpm will result in a horsepower increase. So going from 200-215 ft/lbs even at 1500 rpm will cause the HP to increase at that rpm.

Mar 27, 2014 | 05:40 AM

96capricemgr

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Compare OEM outputs. The 4.8l and 5.3l seem to have used the same heads/cam/intake for a given year and aren't the aluminum block HO versions flat top with a slightly larger cam. Not exactly what you are looking for but should give you some idea.

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