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The heads used on this new 482 are absolutely identical to the set used on the 440 turbo Rodney and Travis built a couple of years back. They are off-the-shelf Butler Performance Group Edelbrock "Wide Ports" that use Ferrea valves. Comp Cams titanium 10-degree retainers and chrome-moly locks hold the Comp Cams 946 series valve springs. They develop 315 pounds of pressure at the seat and 850 pounds open.