L76 Piston Rings
L76 Piston Rings Doing a rebuild on an L76 for my 02 firebird. Stock rods, pistons, crank, with some ARP hardware. The car does a Procharger on it. I cannot figure out which rings would be best for this motor, given its not a race car, and does get driven fairly regularly during the summer. The goal is only 700hp'ish.
I’m having a hard time determining which is the correct set. Do they have a 2.5mm or 3mm oil ring? Any particular material better then the other? I have no issue with a file to fit set, just want to do it right.
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Well...you’ll have to measure. There were some differences depending on year (?) and supplier. I’ve read some had 1.5-1.5-2.5. I’ve also read some had 1.2-1.5-2.5. And also some had 1.5-1.5-3.0. If your sticking with Oem slugs, you’ll have to measure your old rings with a caliper. You can do a search and find ooodles of confusing threads on this very subject here on Tech, as well as other forums. Lots of folks just say fooey and toss the old ones for new pistons, just for this very reason.
Personally, my 6 liter builds have had 2.5mm oil rings when I tore them down.
Personally, my 6 liter builds have had 2.5mm oil rings when I tore them down.
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Joined: Jul 2015
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Post a side view of the ring lands. Using the 2nd land as reference, 1.2mm is a 20% reduction from 1.5mm,
and 3.0mm is a 100% increase. These differences should be detectable by eye.
and 3.0mm is a 100% increase. These differences should be detectable by eye.
Last edited by 88bruce; Dec 7, 2019 at 05:12 AM.