Never been used say Profiler 12* heads but also thing fit Big Chief heads. Pics of actual item. Racers who use the latest cylinder heads or want a unique look for their engines—or both—can now find quality, lightweight aluminum valve covers at an affordable price. These fabricated aluminum valve covers have thick billet rails for superior gasket sealing and resistance to warping. They mount through tubes welded directly to the valve covers—to help maintain gasket-rail flatness and prevent leaks. Fits engines equipped with Dart Big Chief II, 11 degree and 14 degree style cylinder heads. Big Block Chevy with Pontiac Pro Stock style cylinder heads No. 1004527-10049875. Dart Big Chief cylinder heads and the latest Oldsmobile Pro Stock cylinder heads. Weight: 3.0 lbs. each.