Can't find head info - casting number 458842

OldschoolSteve

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Sep 8, 2019
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1978 GMC Sierra Classic
anybody have any info on sbc head casting number 458842?, I can't find anything?
 

Joyrider

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Aug 19, 2020
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95 chevy1500
Oldschoolsteve,I know this post is old but I have a set of heads with the same casting number and was wondering if you were able to get any info on them?
 
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