it is a 4 bolt main. and i believe its has solid lifters i have to take intake off to confirm.
You have to make sure you're not pushing on one that's opening a valve....i pushed on the push rod and i got noting it should not have oil presser still.
lol, ok that makes sense now . . unless his heads are DIZE they will be 73 open chamber likely small valve onesI put that picture up to show him where to look for the casting numbers.
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