Compression tested engine
Did it dry on each cylinder. Then put a capful of oil into each cylinder and retested. This allows you to determine how much of the reduction in compression is a result of “blowby”–gases escaping past the rings on the cylinder–rather than gas escaping around inlet or exhaust valves, or a blown head gasket.
The results:
Dry
#1 480
#2 400
#3 420
#4 480
Wet
#1 540
#2 580
#3 480
#4 530
This signifies to me that we’re getting some blowby. I don’t yet know how to interpret the absolute numbers.