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


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
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US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)