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Old 07-30-2021, 11:32 PM   #1
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Out with 440 in with 413HT- Complications?

Hi all will try to make it short- FMC Transit/shuttle, built 440/Allison 545. Fancy 440 built WRONG, block cut hard, super high compression, burned two pistons so far. So located a 413HT (industrial) low miles and cheap. "Heard", that flexplates were balanced differently can't use 413 fp on 440 and vice versa. Fine tho, I have both. What worries me was what I also "heard" about the torque converter. Poster claimed, that the 727 torque converters were balanced differently(?) and he had to look up the positions for weights (and amount) to tack onto the torque converter? Claims he had vibration at speed till he did the weights? Just wondering if anyone can confirm... again this is Allison trans. Any thoughts on the subject are appreciated, thanks
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Old 07-31-2021, 10:51 AM   #2
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Is the 440 block trashed? New pistons might be easier as long as it doesn't have a radical cam also.

A flex plate sounded like an unusual place to add balance weight.

https://www.jalopyjournal.com/forum/...ancer.1102898/

Does the 727 torque converter fit an Allison trans, shaft size, front pump drive tangs? I'd think Allison supplied the trans with the convertor, Chrysler would have a flex plate that adapted the convertor to their engine.

Out of curiosity, does the 413 have an SAE 3 bell housing or how does the trans bolt to the engine?
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Old 08-02-2021, 11:38 PM   #3
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[QUOTE=Argosy;5854558]Is the 440 block trashed? New pistons might be easier as long as it doesn't have a radical cam also.





Howdy thanks for the reply. I believe it was the actual torque converter he had to tack weights on to. On the FMC, I *believe, they used a mopar adapter plate to an SAE housing, and honestly I don't recall if it was a #2 or a #3, yes regular Allison torque converter. I do know that I had a buy a starter that was basically for a Clark FORKLIFT LOL. Fwiw, I think I'm going to do something akin to your recommendation of buying pistons, but I need a decent uncut block. I have one I'm going to check out tomorrow, cheap 440 looks quite good but I'll check it out well, all I need is the block. Not much of a gamble, only 100$ for a long block I'm leaning towards a decent running low comp 440, then if I feel like it and when I have nothing better to do, I might turn it into an "industrial" 440 with the 413 heads with the super-cooling- haven't been able to locate 413 that seemed even halfway decent and I need Gallopin Gertie up and moving.
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Old 08-02-2021, 11:46 PM   #4
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Oh, no not exactly trashed... it's got a good 1/2" gouge in the upper cyl that would bore out, but the problem is the deck has been shaved to the point where the pistons are sticking out like... whatever. So to get a piston down to a reasonable compression ratio I'd have to bore it over, buy pistons then run a crazy thick cometic head gasket which are 200$+ a piece, and gee, I just don't like that idea.
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Old 08-04-2021, 05:17 AM   #5
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It sounds like it has aftermarket high compression domed pistons. I take when you say the block is cut you mean it has been decked. I doubt they could cut off enough to make the pistons stick out. You might get a one stock piston and the have a good machine shop calculate the compression for you. I’d try to get compression in the 8.5 to 1 ratio. I’m a Chevy guy so my knowledge of mopar is limited. Change the cam to a torque cam and you should have a good runner. Another question is has it been bored our? I’d find a good machine shop and go from there
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Old 08-05-2021, 11:22 AM   #6
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Yes, auld school Keith Black pistons that were discontinued because... they were... crap? Something like that anyway. Yes "decked" is the right word and oh yes they surely can cut it enough to make a piston "stick out". You can have pistons that are recessed like most factory assemblies, flush or proud of the deck. Not the dome part but the actual crown being proud of the deck is not uncommon in HP engines, they "stick out" Yeah that's the number I'm going for as per CR. Thanks



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Originally Posted by SWO Vette View Post
It sounds like it has aftermarket high compression domed pistons. I take when you say the block is cut you mean it has been decked. I doubt they could cut off enough to make the pistons stick out. You might get a one stock piston and the have a good machine shop calculate the compression for you. Id try to get compression in the 8.5 to 1 ratio. Im a Chevy guy so my knowledge of mopar is limited. Change the cam to a torque cam and you should have a good runner. Another question is has it been bored our? Id find a good machine shop and go from there
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