I drove my car yesterday in the 105+ heat and it overheated.....apparently I also blew a head gasket. What are the chances that I have messed anything else up?

 

How much did it overheat? Not an easy answer... Is it still starting? Turning over? Frozen? Any molten metal?

 

Not too high...The blocks on the 240"s are cast iron with steel sleeves...extremely hard to destroy. Let car cool down and then try to start, if car runs ok i.e. no black smoke no knocking sounds you should be good to go...you may even want to try a bottle of bars leak head gasket repair if you don't want to do a headgasket or cannot afford...it works great in a pinch but follow directions to a tee...will probably eventually have to do a headgasket but this will get you buy for a while...should also fix what caused you to overheat first and foremost...

 

If you overheated it to the point that it won't start again and sounds different than normal when you try to start it (faster, no compression, similar to when you have a busted timing belt) than you have warped the head and you've got major problems. If it will start and run but it is bubbling coolant in the overflow tank, then chances are good that you can just replace the head gasket. I haven't had much luck with head gasket sealers on my Hondas; they just gunked up the radiator without curing the problem. YMMV..

 

Even if the head is warped does not mean bottom end is bad...also warped head will not sound like a broken timing belt...if head is warped car will just lose coolant that much faster...(that's why you have a machine shop inspect the head when you pull it off to do a headgasket make sure it's not warped and in need of shaving)a head gasket nor a warped head causes a car to overheat...losing coolant from the 2 does...also block seal(must be Bar's Leak) works great if it's small leak and you follow directions to a tee...not usaully a long term fix just a fix in a pinch....trust me I have yet to see a 240(non turbo) that has overheated and needed a new motor...turbo's on the other hand run at a much hotter temp and can melt rings if overheated until stopped running. still doen't mean you don't test first...