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I’ve also seen D2AE-CA blocks with twobolt main caps.
The 351C block is basically the same casting, drilled or not drilled for four-bolt main caps.
The Cleveland’s lubrication system preparation is something to consider during block prep.
The 289/302/351W oiling system has three main oil galleys, whereas the 351C has two.
Thing is, not all D2AE-CA blocks have four-bolt main caps.
The 351C block castings, despite different casting numbers, are all basically the same casting and can all be converted to four-bolt main caps with help from a qualified machine shop. And if you take away the casting numbers and date codes, these blocks tend to defy detection except for minor casting changes.
The savvy Cleveland builder knows how to get around oiling system shortcomings (see Chapter 6 for more detail).