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02-19-2012, 09:35 PM
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which heads?
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?
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02-19-2012, 10:04 PM
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I found matching # its 3973487
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02-19-2012, 10:10 PM
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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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02-20-2012, 05:34 AM
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487s are good, 624s are guaranteed to crack if they haven't already.
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02-20-2012, 07:46 AM
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Thanks! They have a mexico sticker on em too
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