=========================================================== Need to find the right school to fit your needs CollegeInformation.info has already found it. Get educated on your future ? degrees, financial aid and more! caab8Lbb7yoMza/ College Info =========================================================== > > > Hardness can be added to the metal by applying a > direct flame to the metal (flame hardened) or it can > applied through an oven process. You can add the > hardened seats to the early heads. > > Gary > Just to expand on this, "flame hardened" or the use of an "induction" heater on a localized area, will change the hardness of cast iron. Many times, two light valve re grinds, or one heavy one, are all it takes to completely remove the hardened area. So the depth of hardness is quite thin. With hardened seats installed, a steel seat is then in place. Steel has different properties than cast iron, so the likelihood of cracks or wear is greatly reduced. FWIW Tom =========================================================== Your opinion counts! We?re conducting a survey for a computer service/repair company. When you complete our survey, you will also be entered into a drawing for one of ten $100 prizes. Just click caab8K1b7yoMzf/ Val Rad =========================================================== ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html. b7yoMz.