Im about to purchase an 89 240sx, but it has a blown headgasket, I hear it costs about 40 bucks to buy a headgasket, but are there any instructions online or anywhere that explain how to install it for a newbie. Or an estimate on h ow much it would cost to have it installed for me.

just go and ask local shops for an estimate...mine blew a few years ago i forget how much it cost me.

its about 400 bux labor to do it in a shop. i would tell ya to to it yourself but it is a real pain in the ass to do i just did it a fiew weeks ago. thank god i had the FSM.

its a pain in the ass just swap and u dont wanna pay 700 for a shop to do it

shit for 700 bux u almost got enough for a sr20det