Thread: 427 ford

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does anyone know how to decipher the numbers on a big block ford(427)? I have 66-427 on the back,53dif on the pass side, 352 on the front right, head # is 60900 C4AE. Thanks Greg

Greg there should be a casting number on the side of the block. A C4AE-6015-A type of number like the head. It could be a C5,C6,C7 or C8 or similar as well. 66-427 was fairly generic and is on lots of FE blocks besides the 427. 53 is the mold number and DIF means Dearborn Iron Foundry. The 352 was the series number. If there is no casting number and it has vertical ribs on the side good chance it a service block. Same for the head number. There should be a letter after the 6090 like F for the 427 head in 64. Get the block date code under the oil filter adapter pad and post it. If the first number has two dots underneath it's a 70's service block. If no dots a regular production block date code. The date code for the heads is above the number you posted under the valve cover area. It will be a number/letter/number('s) G.

thank you for taking the time to help me, the reference to the other links was greatly appreciated. I will use your info to help me CORRECTLY identify this engine. Greg Swanson

The 427's were even Identified with color coding.

Blue an green, side oil supply, standard bores,graded 1-6-a-b-c,
used for racing, type SOHC.


Blue an white, top oil supply, standard bores graded1-2-3,
used for street, type wedge.


Blue an red, top oil supply, standard bore, graded 1-2-3,
used for Industrial, type wedge.


Blue an yellow, top oil supply, standard bore, graded 1-2-3,
used for Marine*, type wedge.


Blue, Top oil supply, standard bores, graded 1-2-3,
used for street, type wedge.


Blue, side oil supply, Scalloped bores, graded 1-6-a-b-c,
used for racing, type wedge.


Blue an white, top oil supply, scalloped bores, graded 1-b,
used for service** type wedge.

~ Vegas ~