Compression sounds, decent for less than 5 miles on the engine. I am sure the new rings will seat better after the first 100 miles, but yeah anything over 150 psi you are good for now.
This is one of my pet pevs and enjoy discussing how to break in a new engine:
There are 100s of theories about this. One good old time mechanic (who is passed away now) shared with me how he likes to see it done, made a lot of sense to me and have been doing this for some time now.
Paul the old time mechanic said this:
After pre-lubing and and assembling engine parts, special cam break in lube and some good sticky stuff on the rods and mains, prime the oil system with a drill, all basic stuff on a build. Zinc for cam too.
Here is what I like, he said to put in the thinnest oil possible like 5w30 or the likes, fire it up, run in the cam in for 20 minutes at 2,000 rpm and vary it a bit. Then he said take it out and warm it up, then run it hard and put a bit of a load on it but don't abuse it. This warms things up good, expands the rings out to push out against the cylinder walls and helps them to break in quickly. While the thin oil is flushing everything out and carrying away any fine fine debris to keep things breaking in clean.
After this first run in drop out the oil, change the filter, put in your favorite 10w 30 with zinc, rottella 10w 30 is good. Then finish out your break in for the next 200 miles driving it the way you normally would.
I am sure there are many many different opinions an experiences on this. Just wanted to share this as tribute to my friend Paul a great engine mechanic. Hope others can make use of this, as then his skill set will live on. Thanks
