Google has failed to produce a satisfactory answer, so I'm going to ask y'all: what are the specific changes made to the 4.7L that brought it from the 235hp to the 300hp high-output version? All I have been able to find on the subject are engine reveiws and consumer guide articles, but no real information such as, what mechanical changes were made. And is it possible to get the changed parts and convert my 4.7 to a HO engine?

 

the engine now uses 16 plugs like the hemi.

 

There are a few other changes besides the # of plugs.

The camshaft was redesigned, the exhaust manifold was changed, EGR system was changed, rods are made of different material.

I'm grabbing the details out of the 08 Dodge Ram brochure the dealer gave us when we bought the 1500.

Do you want the text? Cause that is a lot of typing

 

I knew there were more changes.that was the only one I could remmember lol

 

that would be awesome

 

this guy has compiled some good info:

http://wjjeeps.com/engine.htm

http://wjjeeps.com/ho_engine.htm

but before reading the above links it might be best
to get historical and read E-bugger's article at:

http://www.allpar.com/mopar/47.html

 

awesome links HankL, thank you