I have two sets of heads to go on a 2nd sbc im currently building. One set is 3873487 or 3973487( casting numbers are rough) and a set of 462624. Which would you use?
Lt1 75cc on the 3487. If it helps its just a general purpose motor(backup) to either 87 k5 blazer(stock tbi) or a vortec headed 350 yj( other sbc im building). The block is now a 355 and mild cam.
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