Hey Guys, this may be a silly question but I was wondering if I will need an engineering certificate if I convert my holden vy v6 commodore to a v8 (ls1). I've heard from some people that I have too but then I've heard from others that I don't have too because some vy's come straight from the factory with ls1's in them (SS). Anyway. Long story short, vy v6 conversion to vy v8. Do I need an engineering certificate? Thanks in advance.