Hydraulic cam into 273?

djwhog said

Yes just a push rod change depends on year, and you can stay with the adjustable rockers if you like, or get a set of stamped non-adjust rockers.

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Bingo, winner!

Just swap in the cam you want with Hyd. lifters and then ad pushrods for the combo of rockers you intend to use. The pushrods differ on top for the style of rocker arm used and so does there length. OE parts are available for this swap.