[Q] noob question bout roms and kernels

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http://forum.xda-developers.com – hi to all, heres my question i installed a custom rom in my optimus 3d su760 and it is overclocked, i noticed that batt life is shorter cause of the overclock kernel in the rom. i have a backup of my stock rom and using recovery i restored it, now im on stock , and my question is, will it still be overclocked? or it will be set to stock again? do i need to do anything else? (HowTos)