The #66 heads I had were acquired from a friend. I took them apart to install screw-in studs then reassembled them after cleaning. They weren’t perfect and they weren’t completely worn out. Wasn’t running lean.
I think it’s wise to install hardened exhaust seats in any head you’re rebuilding no matter what year the head was manufactured, others may think differently.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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