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| 2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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#7
Mon, May 11th, 2009, 12:18 AM
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Hi JackandJanet, I have gone up this same grade for 25 years and it is not so extreme that I have ever needed to lock out OD, have had 5 5.4's since 97 with the same 3.73 and 2 with the 3 valve so I have a pretty good idea how these trucks run. Surge is only in the 87 tow, like I said I will try the 91 perf as soon as I suck about 35 gallons out of my 36 gallon tank.
 John. 
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