Originally Posted by Gdads51
Her is one from 2019 previous conversation on 261 lifters that supports the info that 261's did not come with the drilled oil passage to support hydraulic lifters.

There were 261's made in Canada and installed in Pontiac's that were equipped with hydraulic lifters, but I don't think that case applies here.

Dan
Where is this drilled oil passage? Is it visible without teardown?

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