4772576 HEADS. Head was built by Mopar Performance to replace the #308 head. Never came on a car. build for Performance. I built these heads from NEW castings and have only had one racing valve job. they have 1.88 Manley Pro flow valves (been cut for valve clearance), bronze valve guides, slightly ported, milled to stock CC's, 10 degree keepers and retainers, NASCAR valve springs, Never driven on the street used very little, 10 plus years since used. $850.00 for pair plus shipping.