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Just bought a mystery 401! Need opinions? |
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Boris Badanov 
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4210 |
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 Posted: Oct/30/2018 at 9:47am |
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Why re-build it, those bores are beautiful. At worst, pull it down, tank it and re-ring it with new bearings. That looks awesome to me. Ball hone it to break the glaze.
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Gremlin Dreams
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JolleyGreenSST
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Joined: Jul/12/2018 Location: High Desert, CA Status: Offline Points: 239 |
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Posted: Oct/30/2018 at 11:43am |
That's what I'm hoping I'll be able to do, but I have to know all the specs are good before I put it back together. |
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"God is good all the time and all the time God is good!"
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JolleyGreenSST
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Joined: Jul/12/2018 Location: High Desert, CA Status: Offline Points: 239 |
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Posted: Oct/30/2018 at 8:34pm |
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Well I tore it down a bit further and I'm not feeling so happy about my purchase...
main bearings are .030 rod bearings are .020 and the the not so nice guy lied to me about installing new bearings and i'm not sure the rings were ever changed either. |
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"God is good all the time and all the time God is good!"
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JolleyGreenSST
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Joined: Jul/12/2018 Location: High Desert, CA Status: Offline Points: 239 |
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Posted: Oct/30/2018 at 8:50pm |
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And here is a couple videos... there is some rusty discoloration on bores 4 and 6 but I don't feel anything on those spots.
crank and bearings cylinder walls 4 and 6 questionable? |
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"God is good all the time and all the time God is good!"
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4210 |
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Posted: Oct/31/2018 at 6:09am |
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I do not want to sound smug, but I fail to see a problem if the crank is not torn up. It looks like the engine was not properly cleaned or got dirt in it. IMO if the crank is good, tank it and re-assemble it with new bearings.
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Gremlin Dreams
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White70JavelinSST
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Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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Posted: Oct/31/2018 at 7:00am |
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What Boris said and what you said yourself earlier, tank it, make sure those water jackets get all and I mean ALL that crud out, I media blast the inside of the water jackets and they come out looking like straight from the factory> clean the block thoroughly after that tanking, check all the dimensions and clearances, new bearings, rings and a gasket set, break that glaze in the cylinders, but if it were me, I'd take it too a reputable shop and have them hone it on a machine, those ball hones are only good when used by experts. If over done, they can ruin a cylinder wall's finish. What do the heads look like? How about the cam? Good Luck
Edited by White70JavelinSST - Oct/31/2018 at 7:53am |
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70 Javelin SST, second owner, purchased 1972
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matty 401
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Joined: Jul/06/2007 Location: Iowa Status: Offline Points: 1727 |
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Posted: Oct/31/2018 at 7:08am |
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when you took the pistons out was it really easy to get them out or did you need to knock them out ?
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72 matador 401 the beast
79 concord 2 door 72 matador 304 grasshopper 68 Rogue 406 93 Cherokee 4.0 5 speed |
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6913 |
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Posted: Oct/31/2018 at 8:36am |
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Take it or leave it, but I would do the following with limited tooling:
- take off the piston rings - take a three finger hone and break the glaze; https://www.hastingspistonrings.com/tech-tips-faqs/cylinder-bore-refinishing - clean and clean some more - put each piston down the respective hole upside down, using feeler gauges, measure the skirt clearance at the mid and top of each hole and record. - if all are under 0.006" and on a budget, clean everything and then clean again, re-ring, re-bearing, have the crank polished and re-assemble - drive and enjoy for several years and determine if you want to budget for a performance rebuild some time in the future.
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JolleyGreenSST
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Joined: Jul/12/2018 Location: High Desert, CA Status: Offline Points: 239 |
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Posted: Oct/31/2018 at 1:07pm |
Thanks guys, the reason I'm upset is the guy obviously lied about everything and he knew he was selling a engine on its last rebuild, I know you can technically go a little bigger on the bores, but it's not recommended and must be sonic checked first. The mains on the crank are on there last leg, luckily it doesn't look to bad and I'm hoping a polish and new bearings will suffice. I havent checked the cam yet, and I have a set of rebuilt 502's already. but the 502's that came off this engine didnt look that bad. If anyone knows a reputable machine shop in the high desert area or even in the inland empire area of so-cal, please let me know.
Edited by JolleyGreenSST - Oct/31/2018 at 1:10pm |
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"God is good all the time and all the time God is good!"
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JolleyGreenSST
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Joined: Jul/12/2018 Location: High Desert, CA Status: Offline Points: 239 |
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Posted: Oct/31/2018 at 1:08pm |
Had to knock them out.
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"God is good all the time and all the time God is good!"
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Boris Badanov wrote:
