rssteiny

my 500 hps have 400 hrs on them i did valve springs at 260 hrs, i want to do a leak down test on them, what is a good and bad # im looking for.

thanks

Young Performance

Anything under 10% is great. My engines with Total Seal gapless rings will leak at 2-4% cold.
I would think you would see in the 10-12% area.
Eddie

Griff

Consistent numbers below 15% is what you are looking for.