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Ive done searching on LS1tech.com and the avalanche fan club and they all seem to like the zo6 cam for the 5.3. I went to barnes and noble and got a book called How to build High performance Chevy LS1/LS6 V-8's. There is alot of info in it and they explain how to install a zo6 cam into a 5.3 and did dyno testing with the zo6 cam in a 5.3 and gained about 40 hp with no other mods. The book details about changing the valve springs and the different lenght push rods. I think I may go this route and get a ZO6 cam, springs and upgraded pushrods.
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