Almost all Chevies have been available with 4 bolt mains since the late 50's.
they stoped making the 4 bolt main 350 in 2002 hope that helps
1972
Late 1987.
1987 was the last year
Because the bolt stop is broken..they have a plastic bolt stop.
1974 was the last model year for points in a Chevrolet.
To protect ozone, stop using ODS. CFC's is one of the main ODS.
Push the safety lever fully forward to dis-engage the bolt stop. Then the bolt can be removed rearward.
boogys
You can stop using it whenever you want.
o Check with a gunsmith
They are still being made