Yes, Buick had posi since about '56 or so. It was a pretty rare option then. It was becoming more popular after '60, but still rare. When I bought my '64 Riv. the salesman tried to talk me out of posi, but I prevailed. '61 & '62 it was still a pretty rare option. For '62 the ONLY unit available that will be a bolt-in is '61 or '62. IF you do find one be ready to PAY up as they are quite costly & even more costly to get rebuilt.
Just my nickels worth.
Tom T.
Tom Telesco
Classic and Muscle Automotive
12 Cook St.
Norwalk, CT 06853-1601
Day Phone 203-324-6045 ET
NailHead Mini-Starters '53-'66
Adjustable Roller Tip Rocker Arms - All NailHeads
Custom forged pistons
Front & rear neoprene seals
Many other "Nail" parts
"If I can't get it, you don't need it!"
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