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Old 02-24-2006, 02:44 PM
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Piston Ring Filing

OK I started the engine build on the 350. This weekend I'll be filing the piston rings and installing them on the pistons. Then dropping them down the bores.

I've never filed any rings in my life so this is all new to me. Can anyone give me some pointers and recommend the gap for a 350 Chevy engine with 10.5:1 compression that will run on the street with some nitrous? I have the rings and the ring filer already, just need lessons

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Old 02-24-2006, 03:05 PM
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What kind of rings are you using? I know Perfect Circle reccomends 0.020-.022" top ring gap and .024-.026" for the bottom ring on a nitrous'd street engine.

When filing, make sure and hold the ring so the gap stays straight. Go slow at first, and check the rings in the bore before you start filing! On the last set I did a couple of the 2nd rings needed very little filing. Make sure that the you file towards the inside of the ring to prevent chipping off any coatings. Make sure to debur after filing before checking them in the bore, using a fine stone or ~800 grit sandpaper on a flat block.
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Old 02-24-2006, 03:19 PM
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Buy yourself a ring filer. The manual versions are pretty cheap. Will save you tons of grief. Deburr well

go by the mfg recomendations for gap.

Square the ring in the bore with a piston to measure the gap.

I use the same method every time. I file the top ring and when done shove down to the bottom of the hole. Then the second ring and leave it in place. That way the first ring you pull out of the bore is the first one to go on the piston. After the oil rings.



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Old 02-24-2006, 10:26 PM
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Thanks I already have the manual filer
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