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any tuner I ask says block guard dont help, its just gonna make your engine hotter. I have one installed too running 20psi on my stock ls block.
Everyone i know that has a block guard has not had a problem with over heating but i will post a pic of a B18c Block that i have that was killed by not having one
Its not overheats it just in the cold weather worms up faster too, its not bad. Alot of people says it dosent help so I dont know I'll just keep mine to be safer.