A 390 is a completely different engine than a 429 and in all but a very few rare cases you can't bore and stroke enough to get to 428. A standard bore 390 with a 428 crank is a 410. The 400 has different motor mounts and bellhousing than the FE.
-Johnboy
If you want to do a 429/460 in place of a 390...Go thru the Bronco Graveyard and they carry D&D hedders for the swap, buy the swap kit..there one of our sponsors !
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Blue Saphire 70 F250 42? in the making/Rollerized C6/4:10 Locker
With a Secret BBF/TBA sometime??
The simple answer is NO. You can't get a 429CJ because it is in the 385 family of engines. And the 428CJ has a 4.13 bore and you can't punch a 390's 4.05 bore out that far without hitting a water jacket or having such thin cylinder walls that the engine won't like. That said I did turn an early 390, 375hp into a 406 (4.03" bore) but then those early high performance 390's had a ton of meat in the cylinder walls. There are very few if any late 390's that have that kind of metal around the cylinders.
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Bear 45/70 Gimp Racing
“There are only two things stopping you, common sense and fear! And not much of the latter.”
To avoid confusing the poor guy, the 406 was 4.13 bore, same as the later 428, not 4.03. And yes, the later 390 blocks are generally not compatible with that kind of overbore.
I haven't seen anyone put an FE into the lowrider F250 4x4 frame, I put the 427 in my early '77 by switching the mount pedestals with a set from a '72, but my early '77 was still the old highrider frame. 429-460 is a pretty easy swap for your truck, will also match up with the tranny from your 400, and could work to your advantage if your state has a smog program, if you get a '79 or newer pickup 460. My 427 actually passed a sniffer test with a small cam in it, but the visual test Was a lot of fun while it lasted, though
To avoid confusing the poor guy, the 406 was 4.13 bore, same as the later 428, not 4.03. And yes, the later 390 blocks are generally not compatible with that kind of overbore.
I haven't seen anyone put an FE into the lowrider F250 4x4 frame, I put the 427 in my early '77 by switching the mount pedestals with a set from a '72, but my early '77 was still the old highrider frame. 429-460 is a pretty easy swap for your truck, will also match up with the tranny from your 400, and could work to your advantage if your state has a smog program, if you get a '79 or newer pickup 460. My 427 actually passed a sniffer test with a small cam in it, but the visual test Was a lot of fun while it lasted, though
Just a typo and a poor proff read. Of course the 406 had the 4.13" bore, just as the later 428 did.
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Bear 45/70 Gimp Racing
“There are only two things stopping you, common sense and fear! And not much of the latter.”
Did it ever occur to anyone he might have meant 428CJ?
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- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
What ever made you come up with a question like that??
Because he asked about going from a 390 to a 429CJ, and then asked about an FE block fitting into a '79 F250.
Quote:
Originally Posted by kell2784
Am I able to build a 390 into a 429CJ fairly easy, or is it more trouble than it's worth?
Will a FE block fit into the same mounts as my 400 in my 79 F250?
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- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
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Was a lot of fun while it lasted, though 
