Quote: The general consensus is the first # is the year so 04 letter I THINK month DEC. 5.7 TRUCK FOR TK. If you have the ignition wires crossing over the intake you have and early model. I think 06 it stopped. Hope this helps. Matt
it does have wires going over the top. i was scared because the part number you put up for the heads is the same part number on my heads on the engine except the letters at the end of the part number. this is number on the head 53021609ba
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