I just spoke with them yesterday at PRI where they had the heads bolted to a 510ci ,9.7" deck all aluminum ( Titus block) Cleveland . Very impressive flow #s. They had a 427 sbf at the show last year with the first set and with low compression and mild camshaft it made just over 600hp. He told me that they raised the compression and installed a more aggressive camshaft and it made just over 900hp! All naturally aspirated. Pretty awesome looking as well.
Ron
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