[Danr55]

The FE motor series consisted of four or five basic engines. 352, 390, 406(?), 427 and 428. Biggest difference between any of them are bore, stroke and heads. 427 was too expensive to build for production because of tolerances and clearences. These were relaxed and the crank was made less expensive and the 428 was born. Most parts are interchangeable. Some parts require a bit of fitting, but will work.

Please keep in mind that my thing was building custom rifles for a long time and I'm comparatively new as related to some of these guys. If I've made any errors, please correct me..