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I have a set of LT1 heads for sale. They are not the 113 heads. The part number appears to be 10207649 or 648, not sure. Please look at the pictures closely. I removed them because one of the self aligning rocker arms jumped off of the #1 exhaust valve and “left a mark” as to say. They are good except for the one exhaust valve. They were on a mildly built LT1 that made 304 RWHP according to dyno runs for tuning. As seen in the pictures, they will need to be cleaned up and possibly reworked. I don’t know what to ask for them so I will start at $300 plus shipping charges. Please feel free to correct me on pricing.