500efi upgrade kits.
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Join Date: May 2004
Location: Monroe, MI
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Mine are the carbed 500's. I don't have my dyno sheets with me but they were around 650 at 5800 rpm. Tyler also did a 500EFI motor for a buddy of mine and he loves it. Tyler reprogrammed his computer after all the upgrades and he says it idles nicer now than it did when it was stock.