Be gentle, but I have a question I'm sure many of you know the answer, but after searching I've yet to find it. I've got a '72 motor home 440 that according to the serial number was an 8.2:1 compression ratio engine. The heads are being replaced with my set of Stealth heads. I'm just trying to get a decent idea of what kind of compression those heads will give me on a stock 440 of that era. I figured since it was in stock configuration, someone would know how much of a jump the Stealth heads are worth.