I re-read the posts that others and myself had on the 68 z28 dipstick and I finally got the one that is correct. Trouble is, I'm still getting a reading of almost 1/2 qt. over full after my oil change. Are there different length tubes that go into the block for the dipstick? I got a repro or whatever from Rick's and I believe it just said "all small blocks". Is this one somehow different than the ones that came on the engine originally or what? I don't know what else it could be. Any ideas? I hate to be so anal about this, but it's frustrating to have everything I'm supposed to have and it doesn't seem to work.