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Originally Posted by dbn04
one thing, they are a very wide motor, make sure its gonna fit in the chassis you get, performance wise i found them to be a little sluggish on take off but when the revs got up  , i know you dont wana compare but at the time i was deciding on the 6 ltr malloo and the boss 290, i went with the maloo, just my opion tho 
good luck, |
Yep they are very wide! Yep the 5.4 iron block is heavy!
I own 4 ( 3 x alloy 4.6, 1 x iron 5.4) ford quad cam engines. One of the 4.6s is in a Mustang Cobra the other in my Shelby Cobra. Identical engines, however once you minus 700 kilograms they seem to be different beasts.
The only way you could compare a 5.4 and a LS7 is if you went for an alloy block instead of an iron block. Then at least the weight would be comparable & price would probably end up being similar. Also the old saying holds true, 'there is no replacement for displacement' so you may as well stroke it to 6 liters.
Also if any of you do decide to go the 5.4 option and can get the 290kw V the 260kw engine don't think twice. It may say there is only 30kws difference but in reality there is a massive difference!
After saying all of this the only reason I decided to go Ford Quad Cam is the way they take boost! I own a Supercharged 5.4 and have driven a 6 liter Holden with the identical supercharger kit and the quad cam seemed to 'like' the boost more (just the way the power came on).
I am amazed that with all this Ford V Holden debate that the Cobra builders who want a Ford in their Cobra don't look to America for inspiration. The 3v 4.6 engine looks pretty good! Relatively cheap, Euro 4 and seeing it has 3 valve heads alot smaller (ie wide). 4.6 Alloy blocks are alot cheaper as well because their is such demand for them in the states.