B303 cam swap on my 92 GT now running rich and falls on its face, idles fine tho.

1992 5.Slow GT

New Member
Oct 4, 2018
Youngstown, Ohio
Also did bbk headers, lifter, cap & rotor. All sensors and vacuum are hooked up, bought new bosch O2 sensors. Also deleted EGR, that mightve caused it too. Timing should be where it was from factory.
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General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
polk county florida
No head or intake upgrade? stock gears?
if I remember right that b cam works in the upper rpm range, stock heads, intake and throttle body may be running out of air flow when the cam starts to work.


i'm familiar with penetration
Mod Dude
Feb 18, 2001
B303 makes nice power up top, so it shouldn't be falling over. Did you degree the cam when it was installed?

Double check the basics. Timing, firing order, fuel pressure, dump the codes and run the cylinder balance test.
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1992 5.Slow GT

New Member
Oct 4, 2018
Youngstown, Ohio
Oops, kinda forgot to look back at this thread, it turned out to be the timing after all. It was my first cam swap and my dad's first time with a ford but luckily had a local fox tuner come out, chip the computer, and set the timing car runs great now and is over a second quicker than my last year's PB at the strip. Thank you all for your help
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