what proceedure do you high tech guys do to remove and install valve guides? i have -80 degree freezers here at work i could throw the guides in. i figure with a little heat on the head and they would go in fairly easy. is this a correct assumption? how do you properly remove them? i won't hammer them out. please enlighten me on the proper methods. or, should i have the dude that is going to cut my seats install them? that's my last resort as i am broke/cheap and do everything myself that i can w/o risking the hp or reliability. thanks.