1970 , 400 block identification
just picked up a 400 block, what is it?
cast numbers are 9799914
cast by dist. 70
stamp in front is YD ( big car, bonneville, grand prix, etc.)
NO "00" in the valley
NO "400" cast anywhere
Lifter bore's appear extra thick, by a lot.
Ribs in the valley to lifter bore are about 1 inch wide and 1/4 inch raised
Drilled for 4 bolt mains
date G289 (7/28/69 ?)
the vin and YD are crisp, almost to crisp. Best guess....service replacement block restamped at the dealer? Hmm...Thick lifter bores?