71 service replacement stage 1 heads. Mild port work. Fresh machine work. Flow tested. 600 miles on them. Have bill from the machine shop with all work done. Great for street motor. Spent $ 953.72 on machine work. Bronze valve guides New valve seats Milled.005 Dual valve springs. Cut spring pockets Cut guide towers Set spring height Set valve tip height Hardened exhaust seats Comp spring locks New valve seals 2.200 Chevrolet 409 valves Can deliver to bowling green. Would prefer not to ship.