What was the last year of the 4 bolt 3.8 Buick valve covers?

[ALMACK]

Can anyone tell me the last year GM made the 4 bolt valve covers for the 3.8 Buick? Thanks.

Alan

 

[mikestertwo]

Can anyone tell me the last year GM made the 4 bolt valve covers for the 3.8 Buick? Thanks.

Alan

I think 1987 in the rear wheel drive cars. The front wheel drive cars were center bolt covers from 87' up.

 

[turbofish38]

1987 on the RWD models and 1985 on the FWD models. Both used the 8445 head casting.