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Old 07-23-2018, 06:04 PM   #1
Stubbz
 
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piston ring Gaps

anyone know what the factory piston ring end caps ?
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Old 07-23-2018, 06:45 PM   #2
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What engine?
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Old 07-23-2018, 07:02 PM   #3
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Probably somewhere around . 024/.022

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Old 07-23-2018, 08:49 PM   #4
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6.2 ls3
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Old 07-24-2018, 09:08 AM   #5
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The LS3 ervice specs in inches from the service manual are below.

top ring .0067" - . 0173"
2nd ring .0126" - .0272"
oil control .0086" - .0335"

It's a pretty broad range, and for performance use, you certainly would not want to be near the min.

If file fit perfecting a blueprinted engine for high performance use, I'd go with something like:

1 .020"
2 .024"
oil .024"

It's on the high side, but removes the biggest problem of butting the ends together if the engine ever got hot.

Make sure to use a good ring grinding tool, the gap ends must be parallel when square in the bore. It's an all day project to perfect, and you have to sneek up on that perfect gap.
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Old 07-24-2018, 10:06 AM   #6
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intended usage plays a big part...staying N/A or going F/I or N2O? That along with piston design/style and cylinder wall finish will dictate final gap...good luck and take/share some pics or ur build...everybody luvs sum pics!


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Old 07-24-2018, 11:01 AM   #7
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Quote:
Originally Posted by frankwjr View Post
intended usage plays a big part...staying N/A or going F/I or N2O? That along with piston design/style and cylinder wall finish will dictate final gap...good luck and take/share some pics or ur build...everybody luvs sum pics!


peace
Exactly. The LS7 and LSA use slightly wider ring gaps, as those engines will see a more extreme use. The LS3 OE ring and bearing specs are pretty narrow gaps/clearances. For really high performance use, go with a tri metal bearing and the clearances opened up a bit closer to .002". Along with ring end gaps opened up a bit. Gotta get those bearing clearances and ring gaps opened up for something that would see higher loads, heat... than a grocery getter.
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Old 07-24-2018, 11:42 AM   #8
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im staying N/A with the car still using factory pistons
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Old 07-24-2018, 12:05 PM   #9
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Mines at. 028 top. 028 middle oil. 020 on my 408 stroker, maggie at 20 psi

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