I've read through the posts, and I know that ideally you want to do a compression test while the motor is warm. I just got done swapping in a replacement motor into my car (bought the car from a guy that threw a rod on the last motor) and am having trouble getting it to start. It cranks well and even started for a second, just wont fire up.

Long story short I'm going to do a compression test but the motor will have to be cold. I know that I want all the cylinders to be within 10% of each other, but what number range should I hope for?