" From: Matt Haas <mhaas@xxxxxxx> " " That only applies to the first generation of shaft mount rockers (1964-70 " 199 and 232 engines). nit: all '71 and some '72-4 sixes also have shaft rockers. that aside, matt is right. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought