NFortin1966

That's difficult to say...It all depends on how well the engine was treated and maintained. You could have two exact engines with the same exact mileage, but one will run like s**t and the other will purr like a kitten. One will still have tons of power while the other bogs on the slightest of hills. Same goes for mileage.

robertsunrus

Hi, not an F-150, but my 2000 Lincoln Navigator has a 4 valve 5.4L engine. Advantage: gets it's torque at a low 2,750 RPM.

Summers22

iTrader: (2)

The 3 valve 5.4 is a piece of crap. Tons of timing issues with this motor. Poor design with cam-phasers, VCT solenoids and plastic chain guides breaking and dropping into your oil pan and clogging your oil pump and starving your engine of oil. The 2 valve has 1 draw back, only 4 threads holding your spark plugs into your cylinder heads. I had a 2001 5.4 2 valve go 175K with no problems and a 2007 5.4 3 valve go 168k with no problems.

Which one was I way more comfortable with and would buy again? The 2 valve every single day of the year. The 3 valve 5.4 is a ticking time bomb.