Thanks Bob, The only examples I've seen or had were screw- together ones Jeff S On Thu, 17 Mar 2005 17:42:15 -0500, bgaines@kc.rr.com wrote: > Jeff S brought up a point about the "X" mark on assembly line big block fuel pumps. Jeff although I have seen numerous examples of the later screw together "clam shell" fe pumps with the "x" on them.The few original unmolested 67GT500 cars that I have seen that I feel confident that they had surviver pumps, did not have the X on them. I wouldn't be surprised if I saw one . Has anyone ever seen that style pump with the"""""crimped on lower half"""""-Small block or big block with a "X" on it. I have only seen the 64 1/2 smallblock pumps with a "x" but they have the screw together type base and not the crimped on. I am wondering if that was only on > the screw together pumps? Bob G. >