Insane Horsepower On Stock LS Engine!!

Man1acs · 07-26-2011, 07:50 AM

http://www.performancetrucks.net/for...-going-485734/

I read this tonight at work in a magazine a friend brought in. Well worth a few mins to read but heres a summary.....

They picked up what they thought was an 5.3L LM7 but, as they found out after the testing was over, it was actually a 4.8L LR4 which is the smallest of the LSx based iron truck engines. One phenomenal part about the engine was the #8 cylinder had a large rust spot etched in it that their hone wouldn't remove....they left it there.

For the top end they upgraded to 2" intake valves, stock exhaust valves and did a very mild port job on the heads. Flow numbers went from 220/220 to 300/220 cfm on the intake and exhaust respectively. ARP studs with Fel-Pro MLS gaskets kept the heads down. A mild Comp Cams cam was installed along with the supplied lifters, pushrods, springs and rockers remained stock. A FAST LSXR intake was installed as well with a big TB.

The short block(except the cam) was all stock. Even the original bearings and rings that were on the motor when it was purchased were reused. They even sanded the rust off the #8 rings and reused them!

Fueling was handled by 75 lbs/hr injectors and upgraded fuel rails. It was run on Rockett 118.

The two turbochargers were CXracing 76mm units run off of flipped shorty truck headers(no name brand headers).

The engine was run for SIXTY dyno pulls over half of which were claimed to be at 1000+ hp. In it's final trim, in between 26 and 27psi, the engine produced just over 1200hp. What stopped the testing was not engine failure but an ignition failure(all sensors and electrical components like the ignition were stock). The engine was 100% a-ok by the end of the testing.

Nightfall · 07-26-2011, 07:54 AM

wait what i am confused LS is a camaro trim engain and this is about a truck I AM SO LOST

SlingShot · 07-26-2011, 08:10 AM

Quote:

Originally Posted by Nightfall

wait what i am confused LS is a camaro trim engain and this is about a truck I AM SO LOST

LS is the family of V8 engines such as, LS1, LS2, LS3 and so on ...

Nightfall · 07-26-2011, 08:16 AM

Quote:

Originally Posted by SlingShot

LS is the family of V8 engines such as, LS1, LS2, LS3 and so on ...

OH OK DUH ok now it makes sence

guess you could take truck mod ideas and put them in a camaro and vice verse now i get it

just was alittle confused on everthing my bad

*DGthe3* · 07-27-2011, 11:42 PM

Moved to general automotive, to avoid confusion

CC Performance · 07-27-2011, 11:51 PM

It was in HOTROD and they tweaked the engine a little, had it all apart before they did the testing

bluetooth-ss · 07-28-2011, 10:54 PM

Read the same article.They tore it down,regapped the rings and put it back together. The 4.8 is definetly a great engine.I put 315,000 miles on the one in my old Silverado before I sold it.

67motorcat · 07-28-2011, 11:15 PM

I read it also....pretty amazing.
The 5.3 in my silverado has only 150,000 miles on it.It's a 2000 model.

But it has just over 6000 hours on it...

and only a water pump replacement 2 years ago.

I used to tow my boat for years every weekend and spend alot of time idling at the job sites with the AC on,and still do.

The trucks have an hour meter if you push the trip odometer switch when the ignition is off.

Wish the Camaro had one,a much better indicator of engine age and use.

The LS engine really is an enginering marval.

07-26-2011, 07:50 AM	#1
Man1acs Drives: 2010 IOM Camaro SS Join Date: May 2011 Location: NJ Posts: 214	Insane Horsepower On Stock LS Engine!! http://www.performancetrucks.net/for...-going-485734/ I read this tonight at work in a magazine a friend brought in. Well worth a few mins to read but heres a summary..... They picked up what they thought was an 5.3L LM7 but, as they found out after the testing was over, it was actually a 4.8L LR4 which is the smallest of the LSx based iron truck engines. One phenomenal part about the engine was the #8 cylinder had a large rust spot etched in it that their hone wouldn't remove....they left it there. For the top end they upgraded to 2" intake valves, stock exhaust valves and did a very mild port job on the heads. Flow numbers went from 220/220 to 300/220 cfm on the intake and exhaust respectively. ARP studs with Fel-Pro MLS gaskets kept the heads down. A mild Comp Cams cam was installed along with the supplied lifters, pushrods, springs and rockers remained stock. A FAST LSXR intake was installed as well with a big TB. The short block(except the cam) was all stock. Even the original bearings and rings that were on the motor when it was purchased were reused. They even sanded the rust off the #8 rings and reused them! Fueling was handled by 75 lbs/hr injectors and upgraded fuel rails. It was run on Rockett 118. The two turbochargers were CXracing 76mm units run off of flipped shorty truck headers(no name brand headers). The engine was run for SIXTY dyno pulls over half of which were claimed to be at 1000+ hp. In it's final trim, in between 26 and 27psi, the engine produced just over 1200hp. What stopped the testing was not engine failure but an ignition failure(all sensors and electrical components like the ignition were stock). The engine was 100% a-ok by the end of the testing.

07-26-2011, 07:54 AM	#2
Nightfall "To Punish And Enslave" Drives: B E RS GBA #72541 3564 CC 220 CI Join Date: May 2011 Location: massachusetts Posts: 3,889 View My Garage	wait what i am confused LS is a camaro trim engain and this is about a truck I AM SO LOST __________________ *C.A.M.A.R.O- Constantly Adding Modifications Addiction Relentless Obsession* 90% canadian 10% mexican 100% american muscle :flag2:

07-27-2011, 11:42 PM	#5
DGthe3 Moderator.ca Drives: 05 Grand Am GT Join Date: Jul 2007 Location: Niagara, Canada Posts: 25,366	Moved to general automotive, to avoid confusion __________________ Note, if I've gotten any facts wrong in the above, just ignore any points I made with them __________________ Originally Posted by FbodFather My sister's dentist's brother's cousin's housekeeper's dog-breeder's nephew sells coffee filters to the company that provides coffee to General Motors...... ........and HE WOULD KNOW!!!! __________________ Camaro Fest sub-forum

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07-27-2011, 11:51 PM	#6
CC Performance Account Suspended Drives: 99 Camaro SS, 79 z28, 70 GTX Join Date: Oct 2009 Location: ST Helens, OR Posts: 1,759	It was in HOTROD and they tweaked the engine a little, had it all apart before they did the testing

07-28-2011, 10:54 PM	#7
bluetooth-ss Drives: 2010 ABM 2SS/RS A6 and 2018 2500 Join Date: Sep 2010 Location: FLORIDA Posts: 2,069	Read the same article.They tore it down,regapped the rings and put it back together. The 4.8 is definetly a great engine.I put 315,000 miles on the one in my old Silverado before I sold it.

07-28-2011, 11:15 PM	#8
67motorcat Blown Cool Breeze Drives: 2011 Black on Black 2SS M6 Join Date: Jul 2010 Location: Pinehurst NC Posts: 1,027 View My Garage	I read it also....pretty amazing. The 5.3 in my silverado has only 150,000 miles on it.It's a 2000 model. But it has just over 6000 hours on it...and only a water pump replacement 2 years ago. I used to tow my boat for years every weekend and spend alot of time idling at the job sites with the AC on,and still do. The trucks have an hour meter if you push the trip odometer switch when the ignition is off. Wish the Camaro had one,a much better indicator of engine age and use. The LS engine really is an enginering marval. __________________ 2011 Black on Black 2SS M6 Had a 2010 IBM 2SS M6 Enjoy life.Think of all the women on the Titanic who passed up dessert.