I have a 1960 261 in my '53 3100 and want to remove the intake and exhaust manifolds to clean and paint them. . . . Thanks
Use a gasket set for a full-pressure oiled 235 (1954-62)- - - -it's identical.
Jerry
The only major difference I can think of would be the head gasket. . . . Other stuff like intake/exhaust, valve cover, fuel pump, etc. should interchange with a 235.
Jerry
Besides the 235/261 head gaskets being different:
To be safe, go with a 1956 and later 235/261 gasket/set. The 1954/55 sets might come with the earlier water pump gaskets (although, I have bought 235/261 gasket sets that included both styles of water pump gaskets).
Also, 54/55st truck oil pan gaskets are different from 55-2nd and later oil pan gaskets (but, again, I have bought 235/261 gasket sets that included both styles of of pan gaskets).