Blown Headgasket!!!!!!!!! Fuq!!!!

sorry to ask this dumb question.. but when u guys say getting a 'block', what doesthat mean???
I have heard so many mods to the engine when u want to boost higher.. can somebody tell me what exact steps u should do...
changing the fuel pump? upgrading ignition system? changing pistons? pistons rings? rods? camshafts? what's the real thing? and u guys were saying "block".. wow.. new word.. haha..
anyways, let me know.. coz i am dumb