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Author Topic: boring a 400  (Read 709 times)

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Offline 67MIke

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boring a 400
« on: November 20, 2005, 10:01:20 AM »
Does anyone know how much you can bore a 400
  I have one I was going to use until I pulled the head. It looks like it blew a head gasket a while back. The piston has broke down and rusted the cylinder wall. So I was wondering how far 400 block would will go - thanks
86 - Power Ram 400 with a limp
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Offline TheRamChargerMan

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Re: boring a 400
« Reply #1 on: November 20, 2005, 10:30:40 AM »
Does anyone know how much you can bore a 400
 
How long can you stand in front of it and talk about ferds & shivvies ??


I'd pull the piston (or what's left of it, and check then.  If the cylinder wall is damaged badly, you can sleeve it.  I'm not sure how much it can be bored, nor how much sonic checking one would cost.
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Offline 67MIke

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Re: boring a 400
« Reply #2 on: November 20, 2005, 10:54:21 AM »
 ;D
 that's a good one 
 Thanks  I won't sleeve it I was hoping to use the motor with out to much fuss, It was freebie. Never fails.
86 - Power Ram 400 with a limp
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Offline IntenseImages

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Re: boring a 400
« Reply #3 on: November 20, 2005, 11:22:03 AM »
i actually would not ask what the maximum it can be bored is. i would ask how much would it need to clean it up?

if it can be cleaned up with a 10 over then i would do that. if it needs 20 then go that far. if it gets into the realm of going more than 30 over, then i would start looking more at what the maximum it can safely be bored is.

 i was always told to only bore just enough to clean it up to prevent future problems.

someplace you might try would be either ray bartons racing engines website or any other engine builders that deal specifically with mopar engines

eric
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Offline 67MIke

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Re: boring a 400
« Reply #4 on: November 20, 2005, 12:26:57 PM »
Well the block looks pretty rough so I wasn't sure if a 400 could go 60 or 80 over with no problems. I was hoping it will clean up at 40 over, but it may not. I was gonna use my 60 over  low compression 440 pistons for a cheap rebuild.
 
86 - Power Ram 400 with a limp
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Offline Evildriver-3

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Re: boring a 400
« Reply #5 on: November 20, 2005, 03:11:15 PM »
  You can go 60 over with no problems so long as it is a fairly good block with little core shift,  even with some core shift it'll be fine,  problem is the pistons,  and you can't use smaller 40 pistons in a bigger bore 400 block
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Offline awyseguy

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Re: boring a 400
« Reply #6 on: November 20, 2005, 05:59:44 PM »
He said the pistons are for a 60 over 440; my minds not fully functioning at the moment.. but I've seen more creative things than that pulled off.  double check you pistons measurements before you have them start boring anything though.. Better safe than sorry.
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Offline 67MIke

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Re: boring a 400
« Reply #7 on: November 20, 2005, 11:30:36 PM »
Thanks guy's. I was doing some reading on 400's and this is what I found, just take it wth a grain of salt. Just let me know if it sounds good or bad. Keep in mind this just a way for me to rebuild a 400 as cheap as possible as I have a lot stuff already.
 "You need a piston that has a compression distance of 1.933 (pin height) iirc to have a 0 deck height in the 400. A .030 low compression piston for a 440 is the L2388 and will go into a .010 over 400 and has a compression distance of 1.926 which will be about .007 below 0. Block deck height does vary some due to production tolerance. If you can find a 400 that will end up clean with a .010 hone job.....or a .060 over 440 LCP will go in a .040 400. These low compression 440 pistons are relatively cheap and you can sometimes find them on E bay. The drawback to them is that they are heavy...."
86 - Power Ram 400 with a limp
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