Compression Check

[srdtrd15]

I did a compression check yesterday and this is what I got:

#1 First crank: 75 Seventh crank: 160

#2 First crank: 80 Seventh crank: 180

#3 First crank: 60 Seventh crank: 135

#4 First crank: 75 Seventh crank: 160

It is a 1994 ranger with 365,000 miles on it. It has run rough at certain times lately that is why I did the check. I am assuming it has wore out rings due to the fact it didn't jump straight to high pressure. Does anyone else see anything with these numbers?

 

[v8318cid]

Cylinder #3 appears to have more wear than the others. Am I correct in assuming that 160 is the minimum threshold for acceptable wear?