Jon.. thanks for the reply. The learning curve on this site is pretty steep, especially for the infrequent user. The info you posted is wonderful, and I really appreciate your time to do so. I recently just became a Chevy guy , having been a willys guy for long time. I thought the l-226 was a similar enough engine to warrant tinkering with th YF. Having a box of these seemed like a good resource for a project. Thanks again for setting me straight.