Close-up of lifter bores in a bare engine block with camshaft lo…

Tight close-up inside a bare cast-iron engine block's lifter valley, looking at two machined lifter bores with the camshaft lobes visible through them, plus adjacent oil drain-back holes and a socket-head plug threaded into the casting. Yellow paint or crayon marks and light surface rust show on the raw machined surfaces.

AI caption January 2006 · Photo 92 of 465