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rings? 30 over 401, file to fit??? |
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amc401t10 
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Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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 Topic: rings? 30 over 401, file to fit???Posted: May/29/2016 at 9:54am |
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Engine is down on compression a little ( 175 fresh to 155 now),
Planning a valve job and rering this fall to early winter. I need ring recommmdations , it's .030 over 401, built 20 years ago, at that time my mach shop furnished the file to fit rings. Can't remember for sure what they were for, seems like he said 396-402 Chevy. Maybe something better is now available , it's not a track car just a street driver. I'd like to do it right and c another 20. Years. It still pulls well to 5500rpm but won't get to 6500 like it used to, Doesn't use oil or smoke but down on power on the top. I put new valve springs in last summer and that helped but it just ain't the same as it was when it was fresh. All opinions welcome! Thanks  Edited by amc401t10 - May/29/2016 at 10:02am |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: May/29/2016 at 11:05am |
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There is nothing wrong with re-ringing it with a quick ball hone to break the glaze.
4.195 rings are common and easy to get, that's if it is 4.195.... Saying a 401 is .030 over can be miss leading since many came out of the factory at +.010 or +.020. I own one that was +.010 factory fresh. |
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Gremlin Dreams
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amc401t10
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Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Posted: May/29/2016 at 4:39pm |
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It is 4.195 but I need larger so I can file fit , I will hone with a dingleberry hone .
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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RSX 401
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Posted: May/29/2016 at 4:43pm |
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How much gap do you have now and what gap are you shooting for?
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I'll follow these lines a little ways more,
Until I can find what I'm looking for. With the pedal to the metal, I'm gaining my speed. Riding down low in my AMC..... |
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amc401t10
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Joined: Mar/09/2009 Location: east tn Status: Offline Points: 903 |
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Posted: May/29/2016 at 9:37pm |
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The only rings I've found so far, file to fit, 4.280
I'd like .016-.019 top ring, maybe a tad more on second. I'm open to suggestions! Won't know for sure till I tear down. Just trying to have all my options on the table when I get ready to build it. |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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Hurst390
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Posted: May/29/2016 at 10:21pm |
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http://www.summitracing.com/parts/slp-r934935
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SC/Hurst Rambler
11.62 120 100% Street Legal |
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Boris Badanov
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Posted: May/30/2016 at 2:13pm |
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I suggest you might want to gap the top rings a tad more loose than that.
I pulled the top land off of #2 piston in a 1970 390 gapping at .016 with forged pistons. Rings expand and close off the gap rather easily. I learned the hard way to consult with the PISTON manufacturer as to recommended ring gap. |
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Gremlin Dreams
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addic
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Joined: May/01/2008 Location: Kansas City Status: Offline Points: 370 |
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Posted: May/30/2016 at 5:57pm |
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I remember looking for file fit 4.195 and could not find any for 5/64 ring ,plenty for 1/16 ,if you could find 4.200
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73 401 Pierre Cardin X P1
73 401 Pierre Cardin X F3 70 X 390 4spd 69 X 401 6 spd 69 AMX 401 auto BSO 73 AMX 401 4speed pc 73 vette 427sb 5spd 73 vette convt.? 08 zx14 |
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amc401t10
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Posted: May/30/2016 at 9:29pm |
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On the total seal sight they list a 4.125 + .080 that's 4.205 .
I think that would work file fit? I'll give them a call if nothing else turns up by teardown. Someone should make .040 over 401 rings , I've found the piston but no rings. And I'll go .018 on gap to be safe! Thanks I've also got a garage buddy that's over mahle motorsports( his crew makes the NASCAR pistols ) he might can get me a ring set . |
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1-owner 74 gremlin x 401, t10,3.73 12 bolt,750carb,reed 250@50 cam, roller rockers,msd,offy int.
72 amc matador 401 727 84 j10 ,360, 727 1970 4-door rebel sleeper(455 pontiac,turbo 400) 79 spirit,4.2 |
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1970390amx
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Joined: Jul/11/2008 Location: colorado Status: Offline Points: 3314 |
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Posted: May/30/2016 at 10:37pm |
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Have you done a leak down test, are you sure the rings are a problem? Could you have a stretched timing chain altering cam timing and this changing your compression?
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1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box |
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