Actual olds heads casting numbers are underneath the valve covers
73l
casting numbers are on the back of the block. there are numbers on the pad by the head on passenger side front that will reveal information too
There is casting numbers on the side of the block, just above the freeze plugs, that will give the casting date. give those numbers to year one dot com or some dealers, that fool with classics. they have the chart to convert the casting numbers to dates.
what does the casting number GM 3892657 say about this engine block
MorTec.com has casting numbers and information
There are none , They had a sticker on them
Casting numbers on top of the bellhousing flange and the suffix number on the block deck in front of the passenger side head. The casting numbers will tell you which block casting you have. The suffix will tell you what HP rating it had, what it was likely installed in, and what transmission was mated to it.
1977
Under the rocker cover.
chevy 350
On the drivers side of the engine in back of the cylinder head there are casting numbers and next to the casting numbers are raised letters either 5.7 or 5.0.