Anyone with HEMI heads on their LS?
If these were advertised as "canted valve, semi circular cylinder heads" they wouldnt be ****.
TECH Fanatic
Joined: Jun 2011
Posts: 1,343
Likes: 8
From: Katy, TX
WRONG, LS7 is 505 hp.
Look at the 2010 EMC, none of the LSx engines in that competition scored anywhere near what the BES Gen III Hemi did. Not only did that 417ci Hemi outscore the closest LSx engine by almost 200 points, but it made about 60 hp and almost 20 ft-lbs more than the 427ci LSX engine.
700bhp BES 417ci HEMI
643bhp RED 427ci LSX
The hemi is alot more than a nameplate.
you never did say the hemi was better. not saying you did. I was just reffering to my own personal vendetta with some local tards that think the hemi is the best thing since sliced bread. I guess I kinda got my wires crossed, however what gets me, is all the hype about the hemi heads and how much of a superior design they have when they are right on par with GMs wedge style head.
now, about the LS7.
same principals apply as the LS1 in the Camaros, Just because GM says it makes this HP, doesn't mean it really does. 98's were rated at 305 from the factory, this translates into about 260 at the rear wheels...which is nonsense.
Most LS1 cars put down 300+ at the rear wheels in bone stock form, which means there is no way they only make 305 at the crank.
most Z06's (LS7) put down numbers that are relevant to 550 at the crank. which Is commonly accepted as the "real" power output of the LS7.
Not trying to start a dick waving contest, I apologize if I came off as rude.
Actually, the HEMI stuff can be pretty badass. The port layout is better than anything the LSx stuff offers.
Look at the 2010 EMC, none of the LSx engines in that competition scored anywhere near what the BES Gen III Hemi did. Not only did that 417ci Hemi outscore the closest LSx engine by almost 200 points, but it made about 60 hp and almost 20 ft-lbs more than the 427ci LSX engine.
700bhp BES 417ci HEMI
643bhp RED 427ci LSX
The hemi is alot more than a nameplate.
Look at the 2010 EMC, none of the LSx engines in that competition scored anywhere near what the BES Gen III Hemi did. Not only did that 417ci Hemi outscore the closest LSx engine by almost 200 points, but it made about 60 hp and almost 20 ft-lbs more than the 427ci LSX engine.
700bhp BES 417ci HEMI
643bhp RED 427ci LSX
The hemi is alot more than a nameplate.
Not saying they cant be made badass...not at all. however, the layout of the heads is NOT as great as everyone makes it out to be.
I'm not bashing the hemi itself, more or less the people that jump on this slow rolling bandwagon and claim nothing can touch it.
There was alot more in the BES Hemi's than just the layout of the heads...I was at the EMC this year.
Not saying they cant be made badass...not at all. however, the layout of the heads is NOT as great as everyone makes it out to be.
I'm not bashing the hemi itself, more or less the people that jump on this slow rolling bandwagon and claim nothing can touch it.
Not saying they cant be made badass...not at all. however, the layout of the heads is NOT as great as everyone makes it out to be.
I'm not bashing the hemi itself, more or less the people that jump on this slow rolling bandwagon and claim nothing can touch it.
There was some cool stuff on that Hemi, but none of it could make that much more power at an RPM range below 6500RPM. That was simply a bad *** induction system, period.
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Verdad Gallardo When you say something like "a HEMI is nothing more than a bandwagon name plate...", it sounds a lot like you're bashing the Hemi and letting your "personal vendetta" cloud your judgement.
There was some cool stuff on that Hemi, but none of it could make that much more power at an RPM range below 6500RPM. That was simply a bad *** induction system, period.
There was some cool stuff on that Hemi, but none of it could make that much more power at an RPM range below 6500RPM. That was simply a bad *** induction system, period.
so your attributing that claim on the design of the combustion chamber alone? not the insane amount of boost or the fuel? yes the chamber helps, but not that much.
Thread Starter
TECH Regular
Joined: Sep 2011
Posts: 460
Likes: 1
From: Elk Grove, California
Well I know those top fuel cars make like what, 8g? But that's with help of nitro meth and a godforsaken blower... the HEMI heads only help sooo much as you said. My point being they are a good head design and I'd love to see how they'd perform on an LS with hopes of running a high amount of boost on pump gas, that wouldn't ordinarily be possible with the smaller wedge heads.
Thread Starter
TECH Regular
Joined: Sep 2011
Posts: 460
Likes: 1
From: Elk Grove, California
That's true... I've had people ask me "hey is that a HEMI?" I drive a 98 Z/28
But aside from the uninformed people that throw the term HEMI around, they are a damn good head design, screw what their mainstream rep is, I want em! 
TECH Fanatic
Joined: Jun 2011
Posts: 1,343
Likes: 8
From: Katy, TX
woah woah...slow down dude...
you never did say the hemi was better. not saying you did. I was just reffering to my own personal vendetta with some local tards that think the hemi is the best thing since sliced bread. I guess I kinda got my wires crossed, however what gets me, is all the hype about the hemi heads and how much of a superior design they have when they are right on par with GMs wedge style head.
now, about the LS7.
same principals apply as the LS1 in the Camaros, Just because GM says it makes this HP, doesn't mean it really does. 98's were rated at 305 from the factory, this translates into about 260 at the rear wheels...which is nonsense.
Most LS1 cars put down 300+ at the rear wheels in bone stock form, which means there is no way they only make 305 at the crank.
most Z06's (LS7) put down numbers that are relevant to 550 at the crank. which Is commonly accepted as the "real" power output of the LS7.
Not trying to start a dick waving contest, I apologize if I came off as rude.
you never did say the hemi was better. not saying you did. I was just reffering to my own personal vendetta with some local tards that think the hemi is the best thing since sliced bread. I guess I kinda got my wires crossed, however what gets me, is all the hype about the hemi heads and how much of a superior design they have when they are right on par with GMs wedge style head.
now, about the LS7.
same principals apply as the LS1 in the Camaros, Just because GM says it makes this HP, doesn't mean it really does. 98's were rated at 305 from the factory, this translates into about 260 at the rear wheels...which is nonsense.
Most LS1 cars put down 300+ at the rear wheels in bone stock form, which means there is no way they only make 305 at the crank.
most Z06's (LS7) put down numbers that are relevant to 550 at the crank. which Is commonly accepted as the "real" power output of the LS7.
Not trying to start a dick waving contest, I apologize if I came off as rude.
idk about the LS7 actual numbers. People say the same thing about the 6.4 hemi. I figure every production engine is somewhat underrated from the factory. Larger engines probably to a larger extent.
Last edited by RezinTexas; Jan 22, 2012 at 04:43 AM.
now, about the LS7.
same principals apply as the LS1 in the Camaros, Just because GM says it makes this HP, doesn't mean it really does. 98's were rated at 305 from the factory, this translates into about 260 at the rear wheels...which is nonsense.
Most LS1 cars put down 300+ at the rear wheels in bone stock form, which means there is no way they only make 305 at the crank.
most Z06's (LS7) put down numbers that are relevant to 550 at the crank. which Is commonly accepted as the "real" power output of the LS7.
I'm seeing stock LS7 vette's putting down anywhere from 430hp to 470hp on the rollers. thats pretty close to 500-545 at the crank. thats given a generic 15% drivetrain loss...I'm sure the IRS eats up a little more.
TECH Apprentice
Joined: Nov 2011
Posts: 337
Likes: 1
From: Murray, KY
Someone in the Arias family a couple of years ago was tinkering around with a LSx and found Nissan 5.6 heads are an almost perfect fit on a LSx. The cylinder spacing was the same, I think like 6-8 of the bolts would drop right in still allowing the valves to have proper spacing. I'm not sure what ever came of it, but it was neat idea and concept, I'd liek to see it work.
