Forgot to add the CF logo is for the Cleveland Foundry. Now what is strange is some FE and FT blocks were cast for a short time there in the late 60's. I've never seen or heard of a 60 block with the CF logo. Early FE/FT blocks normally have the DIF (dearborn iron foundry) letters and the early to late 70's (except the 427 and 428's which remained at DIF) the MCC (michigan casting center) until phased out of production. But hey another FE mystery! Ford did what they had to meet production deadlines and maybe some overflow castings needed to be done at the cleveland foundry. Take a good look at it and try to tell which it is CF or CL. Also look for the DIF if it is a CL. From the way you describe it really sounds like the Cleveland foundry logo. Interesting. G.