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Repairing a 401 that’s already .060 iver |
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5479 |
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Posted: Mar/15/2019 at 4:15pm |
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No problem at all.. Once it is on the interweb, it is free use for everyone!
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Thank you for making a wealth of information available to us Rick! I hope you don't mind me cross posting it, I should have probably asked, or mentioned it to you first.
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5479 |
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Thanks!
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19686 |
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$800 or so to sleeve it all back to original (or some other) bore. At that point figure out what pistons you want and go with whatever bore is most cost effective. Chevy pistons and rods? If you really want a 401 and can't find a closer to standard bore block (getting hard to do!) then sleeving all would be a good option. You'd probably pay $800+ for a good standard bore block, and sleeving done right is as good or better. Often the sleeves are stronger than the block. Or just build a stout 360. The problem with the 0.060" overbore is that the engine will likely have heat related issues, especially if building for the street. You might get by with that on a drag car, but extended running will likely have issues. I wouldn't use it for a street build, would just get a 360 block and maybe use the 401 crank and rods for a stroker build. Four bolt mains aren't necessary, nor the thicker webs if you aren't going to be running it really hard all the time. |
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Frank Swygert
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Ramblage
AMC Addicted Joined: Apr/29/2008 Location: Fresno, Ca Status: Offline Points: 706 |
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Not to sure on the year which I did look up the casting number on it (3198951) ranges from 71-78 and it’s just a bare block
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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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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2458 |
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Tom |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6909 |
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Cool, but also scary. 0.100" wall thickness - if the shop had told me that it would be scrap metal. 0.200" is what I was taught minimum for a cast block so i like the conservative 0.250".
They typically measure at piston ring top, mid and bottom of the stroke, not 5/8" down. Have to do some math now, but if peak cylinder pressure is 22 to 27 degrees ATDC then 5/8" down must be close to middle from TDC to the top of the piston and seeing maximum cylinder pressure??? But have never seen a cylinder fail in that area??? Cracks at the head cap screws or near the bottom of the stroke from piston skirt wear seems common - other then throwing a rod. |
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AMoCoLite
Supporter of TheAMCForum Joined: Dec/23/2015 Location: North Texas Status: Offline Points: 441 |
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I don’t know if it’s practical...but it seems like a pretty cool thought.
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Ramblage
AMC Addicted Joined: Apr/29/2008 Location: Fresno, Ca Status: Offline Points: 706 |
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dang pretty interesting jpnjim. If shops charge 100 to sonic check I’m probably better off just buying my own which I just looked up there around 100 bucks and do build a lot of engines myself not just amc. Would definitely come in handy!
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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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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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https://www.tapatalk.com/groups/amcdragracing/sonic-checking-amc-blocks-t1611.html
^pretty good thread on sonic testing
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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