Pulled these off my HM302. They appear to be HM but I'm not sure as they have no visible markings. There is moderate evidence of water reversion in the aft section of the manifolds (have a high performance cam on the engine these came off of) but maybe someone with better shop skills than me can restore them. Risers are good except for some mild pitting on the flange. Bolt spacing is 2.75 inches. Make me an offer-- want to get these out of the garage before I trip over them again.
Jeff
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