Got questions?

We’ve got the answers—the Summit Racing tech department tackles your automotive-related conundrums. This week, we’re examining the pros and cons of a Ford 390FE engine rebuild.

J.S. El Paso, TX

Q: I’ve got a line on a freshly rebuilt Ford 289 that I’d like to drop in to my 1970 F-100. Currently, the truck has a 390FE engine and a C-6 transmission. I know I’ll need motor mounts, and the transmission might be a problem. When I’m finished, I’d like the F-100 to be somewhat fuel-efficient. Do you think this engine swap is a good idea?

A: The engine swap can be done, but it’s not going to be easy and it’ll take some fabrication. Along with the new motor mounts, you’ll also need a new oil pan and pickup, plus you’ll probably have to modify a set of small block headers from a newer truck. We’d suggest you freshen up that 390 instead. With the correct rebuild, it’ll get comparable mileage around town and have more power on tap for towing. If you opt to go that route, you’ll find some good ideas in SA Design’s How to Build Max-Performance Ford FE Engines.

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Author: David Fuller

David Fuller is OnAllCylinders' managing editor. During his 20-year career in the auto industry, he has covered a variety of races, shows, and industry events and has authored articles for multiple magazines. He has also partnered with mainstream and trade publications on a wide range of editorial projects. In 2012, he helped establish OnAllCylinders, where he enjoys covering all facets of hot rodding and racing.