Thing is, not all D2AE-CA blocks have four-bolt main caps.

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For the street and weekend drag racing, the 335’s oiling system is adequate.

This is the four-bolt main 351C block with a D2AE-CA casting number.

There has always been some confusion when it comes to Cleveland block identification.

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 “M” designation was conceived to differentiate the 351C from the raised-deck 351M, which replaced the 351C in 1975. However, D0AE-L doesn’t always mean a twobolt main block.

I’ve seen D0AE-L blocks with four-bolt maincaps out of Boss 351 Mustangs.

The 351C block casting number and date code are located just above the starter.

This D2AE CA casting number indicates a four-bolt main block according to the Ford Master Parts Catalog, but not all are.

And, it is simple for a machine shop to make a four-bolt main block out of a two-bolt.