LS Head Gasket swap for more power..... - Chevelle Tech
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post #1 of 4 (permalink) Old Aug 14th, 19, 1:15 PM Thread Starter
 
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LS Head Gasket swap for more power.....

LS Head Gasket replacement for MORE POWER!!!

Is there HP and RPM gain in head gaskets and cooling mods on your LS? Yes, and it’s been proven by Robert Yates Racing Engines in their continued development of the GM LS Spec engine for circle track application.

RYRE pulled a track tested engine out of a race car for endurance testing. The engine had the typical OEM type head gasket and cooling system that was run on the car. Testing also included using the radiator right out of the race car. During testing RYRE simulated the operating temps that the engines see, it was noticed in the overflow tank that the engine was off gassing out of the radiator cap. Some head scratching went on with the results of the engine and cooling system testing. Donnie Lewis, part of the RYRE development team and Art Leniti from Arts Radiators, started researching the LS engine program and GMs focus for the engine platform; emissions legal for the EPA and better fuel economy. Donnie’s and Art’s research revealed that GM achieved this through HEAT!! The higher the operating temperature is related to fuel operating temperature, the higher the fuel mileage and less emissions due to the heat that is needed for the catalytic converter to function efficiently. As more fuel is burned, there is more energy generated. In the confined space of a cylinder, this increases the pressure - and hence the temperature, which is converted, via the Otto cycle and the engine design, into mechanical energy to operate the engine. The energy realized is related to the temperature difference - the higher the combustion temperature and the lower the discharge temperature - the higher the efficiency of the engine and the improved fuel economy. In addition, to meet EPA efficiency and emission regs, OEM manufactures use 200 or even 210 Degree thermostats.

We all know running an engine cooler will produce more HP, but sacrifices fuel economy. RYRE needed performance and reliability for the spec engine. Inspection of the head gaskets revealed that GM limited the water around the combustion chamber to maintain the higher temperature. Additional evidence of an imbalance in cooling between the right and left head was evident because of the factory plumbing. RYRE modified the plumbing to consist of equal length lines with a T in the middle running to an expansion tank just under the radiator cap. This allows the gases to leave the heads equally.

RYRE pulled the stock gaskets off the test engine and punched 7 missing holes in the head gaskets. Being that this engine was a spec engine, power output and rpm range of power was well documented. These engines when reaching temp had always “laid over” on the straightaways and just quit pulling. RYRE’s cooling system modifications with parts from Art’s Radiators by RYRE were quite amazing. A simple few holes and some plumbing changes to add additional cooling and release off gases allowed the engine to continue pulling through the entire rpm range! All of this was from modification to the cooling system. Additional track testing showed that the engines ran cooler on the track.
At the end of the day, Donnie Lewis of RYRE used simple physics to convert an EPA emissions engine into a 600HP NA race engine that runs to 7800 rpm!!!!

Straub Tech’s relationship with RYRE has given us the opportunity to take this tech and turn it into a product for the performance LS customer. Available in small bore and large bore, the Straub Tech MLS gasket features the additional cooling holes that allow for more HP and higher rpm!!

346-4031P LS Small Bore Gasket for 4.8, 5.3, and 5.7 For Off Road Use Only. $59.95 Each.
346-4411P LS Large Bore Gasket for 6.0 and 6.2 For Off Road Use Only. $59.95 Each.

Plumbing kits for the “off gassing” are in development now and should be released in the next few months. For now, we advise you to equalize the lengths left to right with a T in the center. Plumb the center port of the T to the system you are using the vent the off gassing. If using the radiator, your best to drill and put fittings closest to the radiator cap. If your using an expansion tank, mount the tank at the highest point of the cooling system

346-4444 Complete plumbing kit to vent heads to radiator This includes 6' of -4 Black Braided Hose. Will need to drill and tap radiator for 2 1/8" NPT fittings. Kit is complete with all fittings needed $159.99
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Chris Straub
Mfg Performance Parts

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Why is it we never have time or money to do it the right way in the beginning but we always have time and money to do it over again?
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post #2 of 4 (permalink) Old Aug 14th, 19, 3:32 PM
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Jon N.
 
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Re: LS Head Gasket swap for more power.....


Jon N.

The only reason someone would want insurance is if they want to pay someone elses bills or want someone else to pay their bills.

BIGOT is a word used by people that can't use logical reasoning to prove that you are wrong when you don't agree with them.
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post #3 of 4 (permalink) Old Aug 16th, 19, 9:05 AM
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Jeff
 
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Re: LS Head Gasket swap for more power.....

Quote:
Originally Posted by cstraub View Post
.... Being that this engine was a spec engine, power output and rpm range of power was well documented....
At the end of the day, Donnie Lewis of RYRE used simple physics to convert an EPA emissions engine into a 600HP NA race engine that runs to 7800 rpm!!!!....
Being well documented, what was the power difference before and after?

Gain was 600-700 rpm increase for peak power. Engine stopped laying over.

*Jeff*

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Last edited by cstraub; Aug 27th, 19 at 2:52 PM.
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post #4 of 4 (permalink) Old Aug 16th, 19, 9:53 PM
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Alex
 
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Re: LS Head Gasket swap for more power.....

Why "off road use only" ?

For those that are going to do this in states where emissions are tested, we have to tell them don't do it.

1969 Chevelle SS --- 468 FTI Level 4 TH400 AFR 290cc's
1997 S10 SS ---LQ9/4l65e

Last edited by cstraub; Aug 27th, 19 at 2:53 PM.
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