Hi, I am trying to find where all the welch plugs are within the 3VZ-FE, in particular welsh plugs susceptible to corrosion. Unfortunately the manual I have does not state anything in regards to welch plugs, freeze plugs, expansion plugs. So far I have found 4(2 for water, 2 for oil) per head. Total of 8. 3 on the block behind each exhaust manifold. Total of 6. 3 on the block in the valley Listing any more and their locations would be great. Thanks.