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That really depends on what the engine is going to be used for. The Buick grand national has a compression ratio around 7.5 to 8.0 to one. Playing with the computer software you can squeeze every drop of hp out of the. I helped a guy modify his software buy downloading his eprom and then converted it to text files so he could edit certain limits up, down. or remove altogether. His next visit to the drags he pulled the front wheels up off of the ground. That was one serious haul butt car.