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they stoped making the 4 bolt main 350 in 2002 hope that helps
1967
Almost all Chevies have been available with 4 bolt mains since the late 50's.
That year came factory with a 4-bolt main engine.
they stop making 2 stokes in 2010
This Year
2005
2005 was the last year
1965
the answer is 1998
2004
2003
1991