I'm draining my coolant today and the manual says to drain the radiator then remove the engine block drain plugs located behind the exhaust manifolds. I looked all over under there and can't find what they are talking about. The only thing that looks like some type of a drain plug is this: it has some weird sized plug though and it sits below the exhaust manifolds. Could someone point me in the right direction as to where these drain plugs are? Do I really even need to bother? Are they somehow hidden on the back of the heads with some impossible way to get to them? Thanks!!!