In order to ensure clean oil passages in the head, I rigged a temporary shaft to hold the camshaft sprocket up, and then cranked over the engine with the starter until oil started to flow. Then I used rags to plug the camshaft bearing oil feeds, and installed the hydraulic lifters into each bore after a fair amount of oil had flowed out. Cheap insurance to make sure you don't end up with scoring of the lifter bores or the camshaft bearings.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC