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Heres a pic of one of the first 598s that was rough
cast that I machined to fit a 4500 and doing the port
work... its done now but I still havent run it yet
to make sure of the port balance using EGTs

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Man Mike... Did you split another one or is that the same one from a wile back

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Same one... that was the last of my W manifolds...
that one and my 420 is all I own