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The FE is a particular engine family encompassing cubic inches from 332 to 428. The 427 Medium Risers, High Risers, and Tunnel Ports also fall into this same family of engines. Bellhousing patterns, flywheel bolt patterns, and exhaust port locations all are the same. For the most part, motor mount patterns are the same with an additional pair of bosses being added in 1965 to accommodate additional chassis hookups. Flywheel tooth count and starter design also changed in 1965. Camshaft thrust plates were added in1963 but with all these differences throughout the years, the engines are still part of the "FE" family. A 1976 FE will bolt into a 1958 car without much issue as a result.