1988 F-350 460 to 300 Six Engine Swap: Awesome Thread of the Week

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Forum member begins engine swap but runs into trouble after spotting some cracking. But it’s nothing he and the FTE forums can’t remedy.

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Thread of the Week: ’88 F-350 460 to 300 Six

OP: B1jetmech

Member’s Request: Will a 300 six frame perches work on a F-350 frame from an F-150?

“I picked up an 88′ F-350 2WD cheap,” writes B1jetmech. “It has a 460/C6 combo. My immediate plans are to swap in 300 six with either an E4OD (updated) or a M5OD (short term). The reason is, I’m averaging 8.6 MPG with the 460 and really don’t need that kind of a loss of fuel mileage for everyday driving. Plus, I just always liked the 300 six…and this is coming from a Chevy guy…LOL!

“So, getting into this kind of swap…My question is: Will the 300 six frame perches work on a F-350 frame that came off an F-150 frame (donor truck)?”

 

‘I’m averaging 8.6 MPG with the 460 and really don’t need that kind of a loss of fuel mileage for everyday driving. Plus, I just always liked the 300 six…and this is coming from a Chevy guy!’

 

Later, once he begins the project, the original poster of the thread discovers a problem. “I really never heard of a 300-6 block cracking,” says B1jetmech later in the conversation, “but if water freezes, it doesn’t matter what you have, it can destroy your engine.” However, despite the brief setback, it’s nothing that he can’t fix with a quick trip to a junkyard and some suggestions from his fellow FTE forum members.

FTE

Short, Sweet & to the Point:

“In quick summary: the 6s, 302, 351s all share most of the same components, including air filter box, etc.; the 460 had its own. So, you may have to address each component,” suggests Beechkid.

Experienced Advice: 

“I am close to finishing swapping a 4.9l into a 1997 F-350 4×4 that originally had a 5.8l, and I kept the original E4OD tranny,” writes Senior Member BWD444. “I think the frames are similar, but not sure. But the 4.9l mounts should work and just bolt in; mine did. You will need a 4.9l PCM from anything 92′ to 94′, and if you use an E4OD, you will need one that had one of those along with the 4.9l engine. You will more than likely need to change the underhood wire harness. …I would suggest if the truck is already a manual tranny to stick with that as you will have more harness issues to go from manual to auto. Also be aware that after 94′ Ford changed the E4OD and moved some electronics from the tranny to the PCM, so do not use a 94′ PCM with a later tranny.”

Find the full Ford Truck Enthusiasts forum thread here and check out the progress that B1jetmech made on his truck, and see it in action via the awesome shots he shared of the project throughout the process.

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