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This final head swap of the day netted the best power numbers. The AFR heads demonstrated that you don’t need to have rectangular ports to make big power by producing 604 hp and 556 lb-ft of torque. The 245s out-powered and out-torqued the LS3 heads through the entire rev range, indicating that not only is an aftermarket cathedral-port head an alternative to an LS3 upgrade, but one that will ultimately offer even more power. Add a matching cam, and the 245s will make even more.