I am new to building Ford engines. I recently bought a complete 302 (Unsure what year it is) and had a valve job done and while the block was at the machine shop they found a couple of cracks. So I found another block and internals (from a 1974 F-100) I was going to use the heads I just had redone on the new block, when I noticed the block and head gaskets have a water jacket hole above every piston and the heads don't have the water hole. Can the heads be drilled out or do I need to find some different heads? The casting number on the block is D4DE-6015-AA 3J20 and the numbers on the heads inside the valve covers are 3K31 and 3K24 and there is a D80E on the bottom of the heads. Any help would be greatly appreciated.
Clean all gasket surfaces, make sure the head gaskets are installed correctly ("FRONT" stamping toward the front, etc) and install the heads and forget about it. They'll be just fine. The parts your using are compatable. -Bigchief.
Couldn't find that number in my book, but D4 does indicate '74. You might want to find the size of the combustion chambers.
Lets see if I can remember all of this correctly, 'D' is the decade and identifies it as the 70's ('C' is 60's), The next number is the year of the decade it was designed and went into production. For example a 6 bolt 289 will have C5 (1965 design) and a 302 will have C8 (1968 design). The next letter is the car family it was designed for. The next letter 'E' I believe was for engineering or engine. the 6015 is the part number and the letter(s) after that are changed as revisions are made, 'A' being the 1st. The other codes 3J20 are casting dates. 3 is the year, the letter is the month and the next number is the day of the month. A is january, B february, ect. Pretty sure they left I out because it could not be distinguished from a number 1. Hope this helps
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