Im new here but have been reading through your threads for a while. Thanks for the info. I have a 4bt dated 1985 with the VE pump. However, the lower tag has been removed. On the rebuild, I found one the pistons got eaten up by a piece of the head gasket. So Im looking for new stock, standard size pistons. Does anyone have a part number? Are they compatible with certain year 6bt? Also, the cam has pitting, so if you have any numbers for that, it would be great. Thanks for your help in advance.