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Old 05-27-2002, 02:29 PM
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Post FI engine and headers

While I'm still waitng for some parts for that frame twistin 383 I decided to do some work on the 'ol rustbucket. I have a '91 F150 with a 351 that has Fords idea of fuel injection. I want to get rid of the single quiet exaust and go with headers and a dual Flowmaster deal out the sides. This thing is lifted with big 'ol tires and the works, it's time to give it a bark. Now do I need to do anything with the fuel pressure or timeing or anything else other than make sure I put the o2 sensor back on? I'm not really looking for a big performance gain, well maybe some better gas milage but all I really want is noise. Can I just bolt them on and go or do I need to do anything?
If y'all could let me know I would appreciate it since I already called them boys near Akron Ohio for the headers and exaust kit.

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Old 05-27-2002, 03:39 PM
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What do you plan on doing about the convertor?

Does your state have an emissions testing?
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Old 05-27-2002, 04:26 PM
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Converter go bye bye. No emissions testing here. Only in the cities. and with 250,000 miles I say the converter is shot.
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Old 05-27-2002, 08:09 PM
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Is this going to be used everyday or for off road fun?
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Old 05-28-2002, 03:25 AM
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Arrow

You should be OK by simply bolting the system on. As you have a speed density system, not many changes can be made (fuel delivery) without the use of a chip. Timing can be bumped. It all depends upon how much the new exhaust system leans out the mixture resulting from the better flow.

Just make sure you block the Thermactor supply tube to the front cat. If the yellow Service Engine light comes on at any time, then you will have to chase codes and correct the problems.
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