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Old 12-11-2012, 02:17 AM
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Originally Posted by ChevroletSS View Post
This is off the subject but can anyone recomend any piston rings. Im looking for standard size as I am not getting this block machined at all.
Pa-Leeze, before you use a piston ring part number that might not be correct, you need to determine if you have a piston w/a deep or shallow oil ring groove.

Up to 1985 the oil rings were deep (0.195" or thereabouts). From about 1986 to about '95 the shallow rings (around 0.165") were used- but there could still be deep groove pistons being used as well.

If you were to use a "normal" oil ring in a shallow groove piston, the piston and ring could be damaged by trying to install the piston into the bore. If you were somehow able to get the piston to go into the cylinder, the engine would be instantly ruined if you cranked it. Not that you're likely to be able to get the piston into the bore in the first place, but stranger things have happened.

Using a shallow ring in a deep groove will work OK but is a hassle to keep the rings in the grooves w/o popping back out.

And if that wasn't enough, there were metric rings (2mm x 1.5mm x 4mm) used from about 1992 to 2002 when the Vortec bowed out. If you had access to the vehicle VIN, the metric ring engines are VIN P.

More on this here.
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