this i ssomething i should know but i don't, so here i ask. what is the difference between the lt1, lt4, ls1 and ls6. here is my theory. the ls1 and ls6 are alike, the ls6 is just a bored and stroked ls1. now here is where i gat lost. are parts interchangable between lt1 and lt4? what is the diff beyween these engines? thanks for shedding some light on this.