Engine Switching Decisions
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Joined: Sep 2003
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From: ~36 miles S of Pittsburgh
Engine Switching Decisions
I have a 1979 F-350 with a bad 351m. I also have a 78 with a good 390 and a 400m avail to me for free that needs freshened up. I am in need of pro's and con's what to do.
Thanks Much
Thanks Much
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Joined: Dec 2001
Posts: 22,436
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From: Louisville,Ky.
The 400 would be a direct bolt in. With a small 4bbl and a RV type cam along with an aftermarket timing chain set without the built in retard, it should run pretty good.
The 390 will need the frame mounts to be changed along with the tranny and all of the accessories on the front of the engine.
The 390 will need the frame mounts to be changed along with the tranny and all of the accessories on the front of the engine.
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