ford or merc flatty?
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From: calif.
ford or merc flatty?
well , there was some question as to wether or not my motor was a ford or a merc.... my heads are! but again confusion about the block. but I do have an answer as to the bore and stroke! 4-1/8 stroke and 3-3/8 bore. and also very spun rod bearing as of last thursday! but I learned my lesson about pushing a old motor to far! she sure got loud and angry with me lol, time for a rebuild .
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From: calif.
I'm not sure yet what is going to happen. may end up going a modern route. I don't really want to but I have a 400 + HP 429 in my 4x4 , thats fresh and emission regs won't let me run it
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ford or merc flatty
Sounds like you have a full house flatty! If it is what you say it is worth more than your 429, not to mention its nostalgia value, to me that is a keeper for sure. If you don't want to keep it let me know.
Fleet Owner
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From: NM
That crank must be a welded up Merc, with that stroke. If it was done poorly, maybe that's why you have a spun bearing. Is this the engine that had like 100 psi compression? With that bore/stroke, it should have had huge compression.
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From: calif.
well to answer the full house question first. 78 f100 4x4, 429-c-6 auto, 62 pontiac grand prix 421 superduty-tri power-8 lug magnesium wheels 4 speed, posi. 65 galaxy 500 convertable, 390 auto 49 cj 3-a , 51 f-1, 85 jeep cherokee (AMC) wife's toyota corolla(lol) 48 knucklehead. 65 hallet flatbottom v-drive, 42 kayot 8 sleeper houseboat. lots of DMV fees, high taxes, huge insurance bills and one very annoyed wife! second question , yeah , its not pretty. I am not exactly sure who did the motor but they certainly werent doing me any favors. it had over a hundred psi compression. who ever did it didnt even paint up the block or heads. its certainly been bored and stoked a bit. but not gently.they didnt even replace the cam apparently. If I can talk the wife into it, it may get done right.but she has about had it with my vehicle addiction. a couple may even go on the auction block. she wants to buy bigger house after the first of the year.
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From: calif.
Originally Posted by fifty2f1
Sounds like you have a full house flatty! If it is what you say it is worth more than your 429, not to mention its nostalgia value, to me that is a keeper for sure. If you don't want to keep it let me know.
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Lead Driver
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From: Kalispell, MT
Full house doesn't have a direct translation, but you've got the right idea.
At 3 3/8" it's as big as it'll go - probably. A very few will bore to 3 7/16" but not many will survive it without hitting water.
When you take it apart, check the con rods - it might have 21A rods which were for the earlier flatty. If so, it would allow for off-set grinding of the 4" crank to go to 4 1/8".
You might also find that 1 wide bearing set is used for 2 con rods rather than the modern system of each con rod having it's own bearing.
Anyway, thats 'full-house'. Max bore and max stroke (without spending $$$ for a new stroker crank)
At 3 3/8" it's as big as it'll go - probably. A very few will bore to 3 7/16" but not many will survive it without hitting water.
When you take it apart, check the con rods - it might have 21A rods which were for the earlier flatty. If so, it would allow for off-set grinding of the 4" crank to go to 4 1/8".
You might also find that 1 wide bearing set is used for 2 con rods rather than the modern system of each con rod having it's own bearing.
Anyway, thats 'full-house'. Max bore and max stroke (without spending $$$ for a new stroker crank)
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Originally Posted by 51f-1fan
I apologize I didnt read your question correctly, I don't understand what a full house flatty is . it ran good till she gave up a ghost. it may get rebuilt but certainly not before the new year.(if its possible to rebuild)
(32-42), and full floating bearings. Max bore is considered to be 3/16 over stock which is 3 3/8". This results in a 296CI motor. Hopefully you can rebuild without having to mess with the bore or stroke. I don't know for sure if they make the sleeves for a 3 3/8 bore but somebody probably does.
good luck with it anyway, it would be a real kick to have that motor regardless of what shape it is in.
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From: calif.
I have a certified marine mechanic freind who says he has done a few flatties over the years . he says he will help me with it . if its not rebuildable I will try and find a new block.
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From: calif.
complete teardown planned
Tomorrow my mechanic buddy and I are going to completely disassemble my flatty. we are going to inspect everything, plus his father will be up from la tonight apparently be built and raced a few back in his day and according to ,my mechanic is kind of excited about looking at the old girl. with any luck I will still have something to work with