Primary tube measured 1 1/2" inside and collector is 2 1/2"I'm curious....
What's the diameter of those primary tubes on those manifolds?
And the collector outlet?
The smog pump holes are 7/8"-18. I found plugs on rockauto... they are an oil drain plug made by DormanProbably going to pick up a set when I get this bonnie back on the road. I knew I remembered finding them on rock auto once but was thinking they where from express vans .
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