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Not a problem
05-10-2007 16:09:21
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Re: OT Ford 460 Question in reply to John T, 05-10-2007 15:34:41
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I'm surprised that your converter hasn't plugged already. Yes, you can do as you describe, and it will help---some, but not much. Trouble is, 460's built after Jan 1, 1988 had extremely restrictive exhaust ports to make them pass emissions, which is why what you do downstream of the ports doesn't make as much difference as you would think. Ford used to offer a "460 EFI" Improvement Kit", which basically was a new cam that was pretty radical on the exhaust side to compensate for the small ports, and a 140-degree thermostat to trick the computer into thinking the engine needed more fuel. It did help, the engine was "crisper", would pull better, and would take more spark advance without detonation. This combo, with a K&N filter, in a 1990 F-350 dually, with a 5-speed and 4.10's, would do about 12 mpg if driven like you weren't mad at it. If I had it to do all over again, I'd go with some pre-'88 heads, or an aftermarket head, a set of headers, 3" exhaust, and the K&N filter. The real problem isn't the converter, it's those tiny exhaust ports on the 1988-up engines.
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