Can someone explain the fuel pump counterweight applications for Yblocks? There is a guy on the FE forum that is rebuilding his 57 Ford 312 and is confused about whether it should have the counter weight or not. I have seen some reference to "early" yblock counterweights. Does this include 1957? Once again the Ford shop manual is confusing. It doesn't show a counterweight in the parts blow up of the cam shaft assembly but mentions it the text. It also has a photo of the assembled timing gear/chain with an arrow labeled "fuel pump counterweight" pointed to the area where it should be but it isn't there. The problem is the cam stub is sticking out too far for the bolt, washer and spacer to secure the upper timing gear. I think he may have misplaced the counterweight. Thanks.

57 Black Tbird 312/auto