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Long shot I know but got a set of 806 old perimeter style heads today for my 5.3 with an S480 and couldn't pass up the deal
Paid 300 bucks for these and was wondering if anyone had any idea of who may of ported them. Yes I know there is likely 1000's of companies now that CNC Heads but these were said to be done about 5-7 years ago in the Florida area
They look like they were worth the money and as long as the valves seal and springs are good, seems completely irrelevant what they flow since that little S480 will be forcing the issue
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Anyone Identify these Heads? Work? 
