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Old 07-26-2004, 07:33 PM
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sbc cylinder head

i have a set of cast iron 76cc heads that i need to identify. it has the the number 51017 and a Y stamped in the end of it. they also have a W and NH in raised letters in the top of it. if you have any knowledge please help.

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Old 07-26-2004, 09:12 PM
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Nothing in Mortec and nothing I've ever seen. Sure they're Chevy?
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Old 07-27-2004, 01:48 AM
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Look between the outer set of valve springs & the inner set. On one end or the other there should be a number with 6, 7, or 8 digits. That's the casting number. Take it to http://www.mortec.com/castnum.htm & find out what they're for.

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Old 07-27-2004, 09:59 AM
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i looked were you said but there no normal casting number on this. the reason i have to identify them is, because i need to replace the spings for a new cam. the first set i bought were not big enough in diameter. that is what the guy building my heads said. could these heads be nascar or drag parts.
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Old 07-27-2004, 02:52 PM
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I ran some the numbers and took a look around the only thing I found matching those numbers where cams. I set of lunati cams. All I know is the if you take the valve cover off and look between the #1 and #3 springs it should be right there. Did you check both sides? There has to be something more there even if they where diffrent kind of heads they would have a stamp of the company on them.
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Old 07-27-2004, 11:09 PM
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Being as they don't have stock diameter springs and no casting # is it possible that maybe you have a cast set of World heads or something??I think World makes a stock replacement set w/ the same humps on the ends that look stock.
Just a idea.You got me.
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Old 07-27-2004, 11:25 PM
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Doesnt sound like you know... but ill ask for the sake of asking... Any Idea where the heads came from? How did you come across them?
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Old 07-30-2004, 12:40 PM
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i found out they are dart spotsman heads. they came on the eng that was in the truck when i bought it. on a bowtie block.
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