Leak Down numbers?

My 83 had compression of 175 down the line. Leak down was about 10%. I posted the results few months back.

I'd be happy with those numbers. We'll just see how it goes...I'd rather do the motor swap than head gaskets, given the time available.
Nick

Just read an article where an experienced builder said that better than 7% is what he thinks is Ok but then goes on to say his builds are 0 to1% for many miles.

http://www.popularhotrodding.com/en...em_understanding_compression_ratio/index.html

My Z is getting a rebuild as it's at 22%. It doesn't run that bad but has considerable blow-by. I worked with a NASCAR modified builder who didn't like the ZG rings as they let no pressure past to pressure seal the second ring which resulted in poor oil control. Not that the motor would smoke or anything, but the tiniest bit of oil in the combustion chamber "poisons" the charge resulting in lower HP.
Nick

When i tore down my 82, I found ring gaps under each other. You'd think ther'd be 3 compression rings.