Re: model b engine cm gear
They generally crack from the exh valve to the cylinder.. sleeve, seat and pinning fixes it (the picture is a diamond block). Late B blocks don't have the clutch servo pad on the left side,an idea ford scrapped before production but the early blocks has the pad. B engines use a positive flow lubrication system as opposed to the A's gravity lubrication for main and cam bearings.
Diamond casting mark means it wasn't cast at the Rouge. No one has yet to identify the foundry that used that mark. Other than having the latest revisions to design, there is no proof that the diamond blocks are superior to Rouge cast ones.
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