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Old July 5th, 2011, 05:42 PM   #3
Brian R.
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Look inside the upper where the throttlebody bolts on. HO uppers have a 60mm opening and non-HO uppers are only 50mm.All HO uppers will say HO or High Output on the top cover plate while non-HO plate will just say 5.0 EFI.

All 5.0 lowers are the same.

Those injectors are only 14lb and the Crown Vic ecm is a speed density system calibrated only for the 14lb injectors. HO injectors are yellow and are 19lb whether they are used with a speed density or mass air system.

The Crown Vic ecm and injectors are only rated for about 175hp where the HO stuff is 225hp.

Last edited by deathbypsi; July 5th, 2011 at 05:46 PM.
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