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Repairing a 401 that’s already .060 iver

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Ramblage View Drop Down
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    Posted: Mar/14/2019 at 12:06pm
I acquired a 401 just the other day for free that’s already been bored .060 over but there’s one cylinder that scared up deep but the cylinders are in really good shape. Would it be good to just sleeve that one cylinder and bore it .060 over or just put it on a catapult and launch it across a river or use it as lawn art or a boat anchor? Or sell it?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shootist Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 12:20pm
.060 over is a bit extreme for a 401. If I were to do anything with it I would sleeve all of them back to factory spec.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 12:25pm
if otherwise good,
not missing the main caps, badly rusted, etc then it's worth a shot to have it sonic tested before making up your mind on it.
Some blocks are ok at .060, but you won't know till you check.

Best case,
there's plenty of meat left, and the other 7 .060 holes can get by with a hone.
Then you're one sleeve away from a good block.

Worst case, even the "good" .060" holes need a bore and core shift has them too thin even at .060".

You never know till you check but if the "good" .060" bores need work you're more than likely out of luck for a street engine. 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 12:26pm
Originally posted by shootist shootist wrote:

.060 over is a bit extreme for a 401. If I were to do anything with it I would sleeve all of them back to factory spec.

I agree but if the other .060 holes look good it's worth checking Smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ramblage Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 12:45pm
mmm ok! Ill have a shop look at it to see it’s good on the remaining cylinders and if they can sleeve it and go from there.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shootist Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 1:25pm
You have a point jpnjim and it really does depend on what you are doing with it. If it is a mild build it would might be ok at .060" but sonic testing will be the tell tale.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 1:35pm
You will probably pay $100 per hole for sleeving plus the cost to bore and hone each to size.

It's already had a "proof test" if it was running at .060" before, so I wouldn't worry about sleeving and boring the one bad cylinder to .060" to match the others so long as you are not stressing the engine more than it was before. Where you could get into trouble is if you plan to make more power with it now than it was before. That level of stress is untested on that block. That's when I would sleeve all eight.

Plus, after sleeving all eight the engine can be rebored however many times you want. Just replace the sleeves when needed.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ramblage Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 1:48pm
Originally posted by shootist shootist wrote:

You have a point jpnjim and it really does depend on what you are doing with it. If it is a mild build it would might be ok at .060" but sonic testing will be the tell tale.

It’s just gonna be a mild build nothing fancy.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote dbltrbl Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 2:13pm
If you decide to sleeve that one cylinder, it doesnt have to be bored back to .060, as long as new piston has correct weight you will never know the difference.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ramblage Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2019 at 2:13pm
Originally posted by jpnjim jpnjim wrote:

if otherwise good,
not missing the main caps, badly rusted, etc then it's worth a shot to have it sonic tested before making up your mind on it.
Some blocks are ok at .060, but you won't know till you check.

It has the main caps as well as not even rusted at all surprisingly to where I think it’s worth rebuilding. Just wanted to get opinions on it!
1959 Pattywagon Stock Rambler Custom
1960 Customized Rambler Super with Dodge 360 & 5spd
1971 Mellow yellow Javelin SST with 360
1972 Babydung Brown Dodge Dart Swinger 5.2 Magnum w/5spd
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