like some solid advice from members that have done this before. I have two manuals to guide me thru this "a 1990 and a 1991". I have heard there were some corrections made in the early edition of the 90. I am not new to the Z and have build a dozen or so motors but this will be my first attempt at any head work. This set of heads have a few bent valves according to my leak down test results. Will the bent valves be easily noticed with the naked eye ?