WTF??? GM has 310 hp H.O 5.3???

[LikeaRock14]

Alright, I went onto Chevy's website, and I see they have a 295 hp. 5.3 and a 310 hp. H.O 5.3. Why an't they make the 310 hp engine standard?!?! GM's sales would boost slightly and they would have a stronger engine, and I imagine along w/ the exta hp it has extra torque too. This makes no sense!!!!!

 

BTW, what does th H.O come in anyways???

[MS3DALE]

The 5.3 "HO" (RPO CODE L33) Is only available in the 1500 Ext.Cab Short Bed 4x4 models and without Quadrasteer.

The torque is the same at 335 lb.ft @ 4000 rpm.

[linda]

310HP 5.3L and a 330HP 8.1L. Its seems almost rediculous to me that they cant pull a few more HP out of an engine with almost 3 more litres to play with. There is absolutly no reason that these 496's should be anything less than 500/500. Especially when you have a 5.3L ripping 310HP. Just doesnt seem right.

[robsawatsky]

310HP 5.3L and a 330HP 8.1L. Its seems almost rediculous to me that they cant pull a few more HP out of an engine with almost 3 more litres to play with. There is absolutly no reason that these 496's should be anything less than 500/500. Especially when you have a 5.3L ripping 310HP. Just doesnt seem right.

The difference is RPM. The 5.3 makes peak HP at 5200 RPM, the 8.1 at 4200 RPM. For a truck that actual hauls some considerable weight around, where most 8.1 equipped vehicles are targetted, a more reasonable comparision would be at around 2500 RPM.

 

5.3 @ 2500 RPM

approx 150 HP

approx 300 ft-lbs torque

 

8.1 @ 2500 RPM

approx 220 HP

approx 425 ft-lbs torque

 

So, you can see when trying to haul a load down the highway, the 8.1 has the 5.3 beat by nearly 50% HP.

[TarheelZ]

BTW, what does th H.O come in anyways???

I think the H.O. with the Vortec engines stands for High Output.

[dannyukonxl]

its like would you rather plow a field with 1000 chickens or 1 strong ox

 

would you rather pull a trailer with a formula 1 car or the dmax

 

those are little extreme but the extra 3 liters move the usable power down lower on hte rpm scale, at least on my 8.1 2/3's throttle nearly feels the same as full throttle, rob pretty much hit the nail on the head though

[BOFH-Z71]

GM's gasoline trucks have almost always been like this.

 

Look at the old 7.4 454 trucks. The 90 model trucks. 454 - 7.4L only had like 240HP, the 350 - 5.7L had 210HP, and the 305 - 5.0 had 180HP. The amount of TQ and the RPM locations that they put out power were all different, but the Peak HP wasn't all that different. I understand the argument though, the Dodge V10 in their SRT-10 RAM is putting out 500HP and it's only 8.3L, but it's also a V10 (and costs a great deal more than ours do), so it's a little different. I know the 7.4s were heavily restricted due to fuel/exhaust guide lines on EPA regs, so they had a low comp ratio, somewhere in the 7-8:1 range I believe.

 

You would think that with the 6.0 LS2 putting out 400/400, and the new 427 LS7 putting out god knows what, that they could give more out of the 4.8/5.3/6.0/8.1 in the truck lines..

 

Oh well, I guess someone some where had a reason for it...

[Cool Zr2]

BTW, what does th H.O come in anyways???

I think the H.O. with the Vortec engines stands for High Output.

Did you what you quoted?

[p0rnm0nkey]

you should check out my 04 sierra 6.0L HO ;) 20in wheels auto ac steering wheel controls w/ full trip computer heated seats oh and 345hp ;)

[TarheelZ]

Did you what you quoted?

Did you?

[Cool Zr2]

BTW, what does the H.O come in anyways???

I think the H.O. with the Vortec engines stands for High Output.

Once again

[BOFH-Z71]

The questions was " What does the HO come in" , not "What is the HO"

 

You gave an answer to a question that wasn't asked.

[TarheelZ]

Uh...I stand corrected.

[LikeaRock14]

BTW, what does the H.O come in anyways???

I think the H.O. with the Vortec engines stands for High Output.

Once again

Que paso amigo? Eres tonto?

[Cool Zr2]

BTW, what does the H.O come in anyways???

I think the H.O. with the Vortec engines stands for High Output.

Once again

That step friend? You are idiot?

What do you mean, please explain.