If I remember correctly 3 and 4 are stamped on the fan shroud of every one of my 'vairs. Joel McGregor ======================================================== you need to spend more time with your Vair!! 1-3-5 on one side, 2-4-6 on the other... No 3-4! Matt Nall Charleston, Oregon http://tinyurl.com/The-Corvair-Patio http://tinyurl.com/Matts-Tech-Pages