Is a Future Chevelle Possible?

[OPGMC]

Is a Future Chevelle Possible?


I hope so!

 

[Tucson Z60]

Why would you get less torque out of a 454 small block then a 454 big block? You can slap a carb on an LSX and get just as much torque. Arguably, the sound is likely different from the valve events in the LS engine.

Old man values die hard

But I think he's referring to the fact that most big blocks have massive torque at low RPM's
Most LS based engines have peak torque at 4000 RPM.

Comparing $$$: The charts below show where the power is at. You also need take into account what they will be used in. An S-10 for instance wieghs almost as much or more than a first Gen Camaro or a 70 Chevelle, they are not as light wieght as one thinks. Your going to have a more mild mannered street engine in the big block. Your going to have a race engine that needs more attention to make it work on the street with the big LSX. The LSX is a monster and with EFI GM says the H/P ges down to 580 from 620.....so much for old man values..
Money wise the LSX is very expensive but it also servers a purpose in todays light wieght cars and purpose built track cars. In a truck it's my opinion it would not cut it for long. I think the engine would last it's the other parts your going to break making power in it's RPM range. Old man values are that on the street maybe less is more. Big blocks work very well on the street but they do suck down some gas!!

ZZ502 for price $9000 from GM VS LSX 454 price of $11,625.00 both are long blocks. Notice the long flat curve from the ZZ502 big block from about 2500 RPM (bottom chart). It's to bad they don't show the entire chart for the big blocks. The rise to power from zero RPM is very quick.

ZZ454 $7500;

LSX 454 dyno sheet from GM:

ZZ502 dyno sheet from GM:

Just for giggles the $17K drop in ready to run from pan to carb, pump dist wires etc ZZ572 720R

This thing will break shit!!
720 H/P 6250 PRM's and 685 Ft LBS of torque at about 4200. There is a guy in town that has one of these in an 89 S10 blazer!!! He has more money than sence

 

[CJ Hungus]

Comparing $$$: The charts below show where the power is at. You also need take into account what they will be used in. An S-10 for instance wieghs almost as much or more than a first Gen Camaro or a 70 Chevelle, they are not as light wieght as one thinks. Your going to have a more mild mannered street engine in the big block. Your going to have a race engine that needs more attention to make it work on the street with the big LSX. The LSX is a monster and with EFI GM says the H/P ges down to 580 from 620.....so much for old man values..
Money wise the LSX is very expensive but it also servers a purpose in todays light wieght cars and purpose built track cars. In a truck it's my opinion it would not cut it for long. I think the engine would last it's the other parts your going to break making power in it's RPM range. Old man values are that on the street maybe less is more. Big blocks work very well on the street but they do suck down some gas!!

ZZ502 for price $9000 from GM VS LSX 454 price of $11,625.00 both are long blocks. Notice the long flat curve from the ZZ502 big block from about 2500 RPM (bottom chart). It's to bad they don't show the entire chart for the big blocks. The rise to power from zero RPM is very quick.

ZZ454 $7500;

LSX 454 dyno sheet from GM:

ZZ502 dyno sheet from GM:

Just for giggles the $17K drop in ready to run from pan to carb, pump dist wires etc ZZ572 720R

This thing will break shit!!
720 H/P 6250 PRM's and 685 Ft LBS of torque at about 4200. There is a guy in town that has one of these in an 89 S10 blazer!!! He has more money than sence

I agree that BBC will tend to make more tq than an LSX in a lower RPM range, that is what they are made to do, BUT I don't agree with the bold statements. I don't think you realize how advanced the LSX engines are. They aren't just made for high performance drag applications. There are plenty of hydraulic roller, pump gas LSX block street cars making just as much power and are just as streetable as the old big blocks. With today's EFI you can tune them to be very very streetable.
Also the graphs you posted show how much better the 454LSX is than the GM454. The BB barely made 500tq and not even 450hp where as the 454LSX made well over 600hp and 600tq, yet you say that Big cube LSX blocks can't make tq.
Also that ZZ572 is a solid roller, on race gas.... I don't know how they only made 720hp...
Just look at these LS based engines that make crazy power on pump gas.
http://www.ls1tech.com/forums/dynam...akes-705-hp-630-tq-update-599-rwhp-video.html
http://www.ls1tech.com/forums/dynam...-itbs-headed-engine-dyno-updated-700-1hp.html
http://www.ls1tech.com/forums/dynam...s/1347689-hke-468ci-chassis-dyno-results.html
http://www.ls1tech.com/forums/dynam...-na-ls-pump-gas-street-motor-870hp-665tq.html

 

[Tucson Z60]

I relize that the LSX is advanced, you would have to under a rock to not know that. But do you relize making power from small cube engines is expensive? Look at the price differenances. That is why I posted the ZZ502 because it compares in cubic $$$$ and is still $2500 cheaper which means you can upgrade even more for the money you spend. The thing is this old school is not dead.
The LSX is great engine and if it were possible I would love to see you experiance both the LSX in your truck and the ZZ502 again comparing cubic $$. I would also even like to see the ZZ454 in it. You would then get the chance to compair the three and understand what big block Chevy power is all about. Like the LSX is a breed all it's own.

Power comes on from not just down low but in the basement, the torque is just instant. With the LSX your going to need RPM before it gets there. If your going to drive it hard your not going to hurt the LSX engine, it's everything it's connected too that going to suffer. Going fast is package deal and that includes the entire package. Skimp on it and you break stuff and might even hurt your self or someone else. That is why I say if your going to have race engine in the LSX that requires more attention for it to work.

That attention is needed everyplace else, that's not to say your not going to need upgrades if you went with a ZZ454 or ZZ502, you will. Your just not going to need as much becuase your not shocking the entire drive train because it takes RPM to get it to peak.

The Fuel injected crate LSX 454 from GM is down 40HP from a carb variant of the same engine. Not sure what your going to spend to gain that back in FI, it can't be cheap. I would love to see eighter one with a Vortec or Paxton blow through supercharger on them!! Those would be impressive.

I have to think that you have never had a big block in something and driven it daily for months or even years, they are a dosile animal that love to drink fuel!! I honestly think the LSX 454 will kill the big block in efficancy when it comes getting the better MPGS. GM nailed on that part!! As they did with many other aspects of the LSX.