DT You will have to show me next time I'm up at your shop. I still don't know what you are talking about. I am about to get in a car with a couple of the Barnetts and head for PRI. Maybe they can draw me a picture or something. If the valves and rockers are evenly spaced, which I think they are, how can the pushrods be different unless the lobe spacing is different? Barnett gets (or got) some of his his blocks without the lifter bores cut. Never asked about it. I just swept the floors and kept quiet. Later.