Looks like a '61 to me. F 13 1=June 13, 1961. With it being a car engine, it probably has a fiber cam gear too. If you are planning on having it apart soon, I would recommend replacing the timing set and upgrading the cam gear to an aluminum one.


-Tim
'51 Chevy 3104 w/'56 235, 848 Head, HEI Dizzy, Corvette Cam, Split Manifold and Dual Carter YF's