5k miles on motor,stock h.e.I dist.motor came out of 79 g20.its a jegs motor.I'm sorry guys I got the truck with it already installed so I don't know compression,or internal specs.its starts fine when its cold sone as it heats up and you cut it off it wount start again until it cools off.I've wrapped the starter with heat shielding . Sorry I don't know much guys about this motor