In a message dated 8/31/2006 7:02:16 PM US Mountain Standard Time, HallGrenn at aol.com writes: only used on the 1961-62 FCs Bob, They were used through '65 Briers on FC's--95 and 110 engines. Bob Bob, I'll have to check again, but I'm sure that the Chev literature said they were discontinued in 1963 or 1964. Regards, Bob Helt