Those heads have induction hardened seats in the chamber to deal with no lead fuel.
If you move up to 1.77” valves that needed hardening will be cut away and you will need to install seats.
If you stick with the 1.66” valves and your stock seats are not too beat up then you might get away with just a light valve job which will not cut through that induction hardening.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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