I thought the original owner told me they were SBC rockers and that is what I ordered. When they would not fit over the studs (7/16?) I went down to the engine shop and we talked about it. When he looked at my original rocker arms he said they were 1.7 BBC and that no one made a 1.5 BBC rocker. However, he suggested I enlarge the slot in the SBC lifters which is what I did on my Bridgeport, using the nuts and rocker washers that were on the engine when I got it (they fit fine in the sb rockers). They appear to fit fine. No interference, no rubbing of the pushrods on the holes in the head and the end of the rocker is on the valve.
Did I say I don't know what I'm doing???
