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im not sure if these are the right numbersbut on the bottom of the heads was C90E and the block was (near bottom on pass side)C90E-6015-b if these are not right where do i look
 

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Yes you have found the correct spots for the casting numbers.If you want even more info look under the valve cover area for the date code and right beside the casting code on the block.You will see a small set of numbers and asingle letter that will look something like this 9H23.The first digit9 stands for the year.Your already supposed to know the decade and since your casting numbers start with a C which stands for the 60s decade this would tell us it was cast in 1969 .The letter stands for the month of the year.A would be JAN,B would be FEB and so on except for the letterI which ford excluded so as not to cause confusion with the number 1.The next numbeers are the day of the month.So in the example I gave you the date code would read 1969,AUGUST 23rd.The date code is important because sometimes ford carried the same casting numbers for more than one year.Example D4AE-AA is a casting number on 351W blocks from 1975 to 77. The 6015 part is just a basic casting number common to blocks.
 
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