in the 96+ 4.3 use only ac delco platinum plugs #41-932. bosch plugs have been known to crack and break apart when used on a 4.3.
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2000 Chevy Blazer ZR2
Performance Mods: Numerous
Suspension Mods: Some, but not enough
Exterior Mods: Just Right
1987 Buick Turbo T Dark Red
Low 11 sec sleeper
.030 4.1 block, PT6262E, & other odds and ends....
My Cardomain