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Old 02-25-2003, 07:59 PM
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Post Ring End Gap

I just purchased some Speed Pro plasma moly file fit rings. The rings are for a 400 chevy that is .030 over (4.155). I checked the out of the box end gap of the rings. The compression rings end gap ranged from .028 to .041. The 2nd rings measured from .021 to .035. I am using KB pistons which indicates the use of a top ring gap of .027 and a manufacturer's 2nd ring end gap of .020-.022. The rings are summit #SLP-R5879035 which indicates a 4.160 ring size. The bores all check out fine.

Should the rings have an end gap prior to filing? If so, what should it be? My end gaps seem excessive.

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Old 02-25-2003, 08:09 PM
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measuring end gap out of the box means nothing, put the ring in the cylinder use a flat top piston and push the ring squarely down the bore about 1" and check the end gap, they must be at about the max for the piston spec if you are running Keith Blacks, pay particular attention to the top ring. Get a ring file and go to it!
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Old 02-26-2003, 08:15 AM
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If they have that much gap in the bore, either they are not file fit, or they are for a larger bore size. My Childs Abert started at .005 or so out of the box.

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Old 02-26-2003, 09:19 AM
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By checking them out of the box, I mean prior to filing. I used the proceedure outlined by bobcrman to obtain my results. One of the rings appears to have been filed. I am suspecting that it is a used set. Thanks for your help.
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