July 2006 UTC The LT block was still designed in inches it has the same 4 0 3 48 combo that all prior 350 s had That said anyone calling the LS1 a 350 either works for a parts store or doesn t check their facts most people refer to it as the 346 that it is if they call it in cubes The LS7 is at least still technically a 427 even if it isa 427 9 cubic inch engine Ford can keep the 428 number 16 18 5