Dart Heads, Heavy duty iron castings, 308cc intakes, 2.25" intake stainless undercut stems, 1.88 exhaust stainless 1 piece, PAC Hyd Roller Springs 200lb on seat 500 lb open. Titanium retainers. These head made 670hp on a pump gas 9.8 comp, 496 hyd roller I took apart for an upgrade. . Excellent heads, 2400 miles on them. Valvetrain geometry was dead on no valve guide wear. Has dart adjustable pushrod guide plates and extra long ARP rocker studs to achieve proper rocker Geometry and valve stem swipe pattern. These can be bolted on and are ready to go. Motor I pulled these from is getting replaced by a bigger motor. I don't sell junk, these are quality heads with top quality valves, springs, titanium retainers, studs and Dart guide plates.Please no dreamers, scammers or nutters. $1000 firm