70 L89 engine

[x33rs]

That seems to vary sometimes. Not to steer off subject but when it comes to aluminum intakes, I think the BBC used washers under the bolts from originals I've seen, but some SBC aluminum intakes didn't.
I know the 69Z's did not use washers under the bolts on the intakes.

Doesn't really make a lot of sense but that's what I've observed. Different assembly plants I know, but bolts gulling up aluminum you would think would want washers as kind of a standard procedure across the board.

[SS427]

Originally Posted by x33rs

That seems to vary sometimes. Not to steer off subject but when it comes to aluminum intakes, I think the BBC used washers under the bolts from originals I've seen, but some SBC aluminum intakes didn't.

That is correct, the BB engines (at least in 69/70 used a washer headed bolt other than where the engine lift bracket was bolted to just like in Charley's photo.