I had Total Seal gapless rings in my 455 motor, the leakdown rate was less then 2% ran great but had a lot of reversion. I removed them when I refreshed the engine and the reversion went away. I was using a header evac system. Perhaps if I had vacuum pump it may have eliminated the reversion. I think gapless rings may work better with a vacuum pump.
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Tim Corcoran
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