Question for all ya. Is the only difference between the Navigator's 5.4L 32V In-Tech V8 and the Ford 5.4L 16 Valve Triton V8 the fact that the Nav. uses dohc and the Ford trucks use sohc? If that's the case, why don't the trucks use a dohc 32V setup? Wouldn't that give more power? And aren't the Triton and the In-Tech manufactured by the same company? So it should be easy enough to make a 32 valve 5.4L Triton? Also, what does the Ford Expy use? Is that a sohc 5.4L Triton? I know some have the 4.6, but sticking with just the 5.4 for now, it is just a sohc Triton, correct? I dunno. Just random questions running through my head.

Ryan

 

Ryan-
You got it basically right. The Lincoln uses the DOHC setup as does the Ford F-150 Lightning. I believe (now don't quote me on this, but I think this to be true) the F-Series doesn't use the DOHC setup is because Ford is trying to keep its more quotidian trucks' cost down, as the DOHC engine costs more to tool and build. Yes, by having DOHC, there would most definitely be more power, at least more torque if not hp. The Expys do use both the 4.6 and the 5.4, although I believe nowadays it would be hard to find a 4.6 Expy...and there is a "special" Expy that uses the Lightnings supercharged DOHC 5.4, and its called the Thunder. One (or is it two?) word: Badass.

 

Just remember the blocks are different bewteen SOHC and DOHC, you can't just swap the heads.

 

>Ryan-
> You got it basically right. The Lincoln uses the DOHC
>setup as does the Ford F-150 Lightning. I believe (now
>don't quote me on this, but I think this to be true) the
>F-Series doesn't use the DOHC setup is because Ford is
>trying to keep its more quotidian trucks' cost down, as the
>DOHC engine costs more to tool and build. Yes, by having
>DOHC, there would most definitely be more power, at least
>more torque if not hp. The Expys do use both the 4.6 and
>the 5.4, although I believe nowadays it would be hard to
>find a 4.6 Expy...and there is a "special" Expy that uses
>the Lightnings supercharged DOHC 5.4, and its called the
>Thunder. One (or is it two?) word: Badass.


#1 The Lightning DOES NOT USE THE DOHC 4 valve HEADS!!!!!

#2 If ANYTHING a 4 valve head will give more high RPM HORSEPOWER if the extra potential of the 4 valves are used. In very general terms, low speed torque ACTUALLY SUFFERS on a 4 valve head compared to a 2 valve set up unless some type of variable valve technolgy or variable intake technology(what Ford uses) is used. Please realize there is such thing as too much air flow at low RPM if it's too slow.

#3 The Thunder has not made it to production yet(as far as I know) and the lightning does not use a DOHC 5.4.....Oh yea, I already said that.

 

>Just remember the blocks are different bewteen SOHC and
>DOHC, you can't just swap the heads.


Actually the blocks are exact and the head swap would be the easist thing. The 4.6 blocks are different for the Cobra and SOHC but the heads would still interchange.

Here is the hard part. Timing cover, timing gear, different tensioners plus countless small parts needed. It'd be easier just to get a junkyard Nav or Cobra motor if you really wanted DOHC than to try and swap heads.

 

Actually you don't have to hunt down all these swap parts, Just go to Karkraft.com and purchase a compete Navi engine brand new and use that as your start in a build. Also as it comes stock it has 300 hp, just add the following: Bigger MAF sensor, bigger throttle bore, an after market cold air intake, a set of headers, high flow cat y-pipe, a cat back exhaust system and finally an after market chip congigured for the Navi engine and changes and you have approximately 370 naturally aspirated horses. Not bad for a stock engine with 12000 mlie warranty.