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Repairing a 401 that’s already .060 iver |
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Ramblage
AMC Addicted Joined: Apr/29/2008 Location: Fresno, Ca Status: Offline Points: 706 |
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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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1960 Customized Land Barge Rambler Super with Dodge 360 & 5spd
1971 Silver Bullet Javelin w/232 Engyne! 1972 Crappy Green Javelin w/401 and AW4, still in the works |
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shootist
AMC Addicted Joined: May/24/2012 Location: Triad, NC Status: Offline Points: 1023 |
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.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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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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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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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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I agree but if the other .060 holes look good it's worth checking
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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Ramblage
AMC Addicted Joined: Apr/29/2008 Location: Fresno, Ca Status: Offline Points: 706 |
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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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1960 Customized Land Barge Rambler Super with Dodge 360 & 5spd
1971 Silver Bullet Javelin w/232 Engyne! 1972 Crappy Green Javelin w/401 and AW4, still in the works |
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shootist
AMC Addicted Joined: May/24/2012 Location: Triad, NC Status: Offline Points: 1023 |
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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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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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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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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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Ramblage
AMC Addicted Joined: Apr/29/2008 Location: Fresno, Ca Status: Offline Points: 706 |
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It’s just gonna be a mild build nothing fancy.
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1960 Customized Land Barge Rambler Super with Dodge 360 & 5spd
1971 Silver Bullet Javelin w/232 Engyne! 1972 Crappy Green Javelin w/401 and AW4, still in the works |
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dbltrbl
AMC Apprentice Joined: Jul/06/2011 Location: Finland Status: Offline Points: 80 |
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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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Ramblage
AMC Addicted Joined: Apr/29/2008 Location: Fresno, Ca Status: Offline Points: 706 |
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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!
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1960 Customized Land Barge Rambler Super with Dodge 360 & 5spd
1971 Silver Bullet Javelin w/232 Engyne! 1972 Crappy Green Javelin w/401 and AW4, still in the works |
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