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Author Topic: Moly or Cast Rings?  (Read 1398 times)
69-er
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« on: August 22, 2009, 10:18:48 AM »

I have an old SBC that is maxed out at 0.60Ē over.  It has about 70,000 miles since it was rebuilt.  Several thousand miles ago, I tore down the motor and did a quick hone and ran the motor with no apparent blow-by problems.  (On cold mornings, it does sound like a diesel!  Piston slap?)  I canít remember what type of rings I used.

 

For other reasons, I have torn down the motor again and Iím going to try to do a hone one more time.  I have no idea what the actual taper is.  There is very slight ridge I can feel, with the sides of the cylinders being a little less, so I know there is an out-of-round condition.  I can still see a lot of the original cross hatch on the walls, but the pattern is irregular and somewhat patchy.

 

Since this is not the correct way to be resurfacing the cylinders, I was wondering what would be the best ring to use that could tolerate the irregular wear.


Thanks!
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JohnZ
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« Reply #1 on: August 24, 2009, 03:59:52 PM »

All rings are cast - moly just refers to the molybdenum-based facing applied to the contact surface of premium rings (vs. the chrome facing on older rings that took forever to seat). I think moly-faced rings would be better, as they will seat faster (assuming the hone pattern/surface is done per the ring manufacturer's instructions).
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'69 Z/28
Fathom Green
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