I think the single pattern cam recommended above might not be the best choice along with the suggestion that the 1.66 valves be retained. Dual pattern cams are chosen to crutch a weaker exhaust side and keeping the smaller valve will hamper exhaust flow even more than a 1.77 valve (which usually benefits from the dual pattern).
Maybe I just haven't seen enough late heads with the induction hardened seats because the ones I've come across are showing pretty severe recession after 50 years and the shop usually has to install hardened seats so the valve face isn't flush with the chamber. Maybe it's a California thing and we probably were forced into no lead gas years before other states?
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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