pt70 said

From post #1; those machined areas are for cutter clearance when the lifter bores are machined. I've never seen them on any blocks I've taken apart. If you look at the cutter marks, the front cylinder has none, and they get deeper as they reach the rear cylinder. This tells me that the outer mold wasn't properly aligned when the block was poured.

From what I found out those heads are from a 1967 318 truck engine with a water heated intake manifold.

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