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AMC 401 Bore Recommendation
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AMC Addicted
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Joined: May/15/2018
Location: Ontario
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Points: 6882 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Jan/14/2022 at 1:22pm
The difference between a 0.020" over and 0.030" over ring for a 401 bore would be 0.033".
You remove about the same amount off the top ring if you used hypereutectic pistons.
People are not checking and fitting rings for proper gap any more?
Grinding or filing rings is not a big deal on bigger bores this close. 4" and under bores they say 0.010". The smaller the bore, the more critical the sprung radius, not the other way around.
Or just buy 4.185" rings, pages of them:
 
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DragRacingSpirit View Drop Down
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Points: 903 		Post Options Post Options   Thanks (1) Thanks(1)   Quote DragRacingSpirit Quote  Post ReplyReply Direct Link To This Post Posted: Jan/14/2022 at 2:07pm
Any time I order custom pistons I always get an extra right and left.
Best 1/4 mile 8.99, 1/8 mile 5.71, 60 foot 1.27, no power adders
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garland performce View Drop Down
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Points: 172 		Post Options Post Options   Thanks (0) Thanks(0)   Quote garland performce Quote  Post ReplyReply Direct Link To This Post Posted: Jan/14/2022 at 10:24pm
4.185 pistons are available have ordered several sets
Good thing is you can get about any ring package 
They are .060 400 sbc rings
Give me a call at the shop Monday-Friday 7-4 If I can help with your build
816-547-5695
John Garland owner of Garland Performance
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SC397 View Drop Down
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Joined: Apr/30/2009
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Points: 5476 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/15/2022 at 12:23pm
Originally posted by PROSTOCKTOM PROSTOCKTOM wrote:

Originally posted by SC397 SC397 wrote:

First, have a qualified machinist measure the bores and check for tapper.
Then ask him if it will be ok at the bore it is now. 
If you read the first post he made it's just been bored .010" over.

Tom

Oops. My hairy eyeballs aren't working too well these days.
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amxron View Drop Down
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Points: 295 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amxron Quote  Post ReplyReply Direct Link To This Post Posted: Jan/18/2022 at 12:16am
You can get 428 Ford rings in most any oversize. I use .040's (4.17" in stock bore

390's).

Ron.
AMXron
Fleet/Jeep Mgr.
Orbit AMC/Jeep
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