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Hi-Ram gains

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Old Aug 27, 2019 | 11:38 AM
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Default Hi-Ram gains
I see multiple threads where people claim the Hi ram does not gain but hurt ls3 engines, most seem to be talking about mostly stock though. My plan is full bolt ons, underdrive, big rpm cam, cutouts, headers, vararam, flex fuel, meth, 102 TB. And I want to add a nitrous plate kit shortly after too and eventually move to twins. Does anyone know how the Hi-ram works compared to a rod mod on a more modded ls3?
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Old Aug 30, 2019 | 12:15 PM
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Good LS3 info in here: https://gwatneyperformance.com/the-u...dyno-shootout/
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Old Aug 31, 2019 | 10:06 PM
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THANK YOU! I had seen a few on mostly stock or heavier modified on the engine side. That helps make up my mind thank you!
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Old Aug 31, 2019 | 10:14 PM
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No problem. If you are looking to build a max effort NA LS3. I would definitely give gwatney a call to see what they can do for you.
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Old Sep 29, 2019 | 03:57 PM
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would love to see what a more realistic testing on stock LS3 motors and different intakes would be like
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Old Sep 30, 2019 | 09:10 AM
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Hot Rod did a test a while back. Search for it.
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Old Sep 30, 2019 | 07:53 PM
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Right now as far as I know the stock block heads and cam LS3 is in the high 8. Both Texas speed and Gwatney are top shops on that race I know for sure tsp uses the Holley high ram intake cause it lets them rev to 8 K rpms and likely also using a 4600 stall this as for Texas speed is with a Camaro.

Last edited by xBoostx; Sep 30, 2019 at 08:05 PM.
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Old Sep 30, 2019 | 08:07 PM
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Originally Posted by xBoostx
Right now as far as I know the stock block heads and cam LS3 is in the high 8. Both Texas speed and Gwatney are top shops on that race I know for sure tsp uses the Holley high ram intake cause it lets them rev to 8 K rpms and likely also using a 4600 stall this as for Texas speed is with a camaro.
I guarantee their converter is 6-7k rpm. Should be 200rpm above peak torque. And those cars are not stock heads. Both use small bore LS7 style heads with stock bottom ends.
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Old Sep 30, 2019 | 08:31 PM
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Originally Posted by truggiero19
I guarantee their converter is 6-7k rpm. Should be 200rpm above peak torque. And those cars are not stock heads. Both use small bore LS7 style heads with stock bottom ends.
They do use the small bore ls7 heads still stock bottom end 4 passes though still hats off here.
I talk to Guatney sense tsp keeps tight lips they where unable to help me.

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