This 1971 400 block (D1AE-A2C) has a small-block bellhousing bolt pattern, which is quite rare. You can use the social sharing buttons to the left, or copy and paste the website link: SHARE THIS ARTICLE: Please feel free to share this post on Facebook / Twitter / Google+ or any automotive Forums or blogs you read. For a comprehensive guide on this entire subject you can visit this link: LEARN MORE ABOUT THIS BOOK HERE This Tech Tip is From the Full Book, FORD 351 CLEVELAND ENGINES: HOW TO BUILD FOR MAX PERFORMANCE. Any Cleveland two-bolt main block can be converted to a four-bolt main if you have the stock iron or aftermarket steel billet caps. And if you take away the casting numbers and date codes, these blocks tend to defy detection except for minor casting changes. All have the same main webs and pan rails.
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.
There has always been some confusion when it comes to Cleveland block identification.
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