Mustang Forums - View Single Post - Anyone intrested in 5.4L swaps, in here. Need you to opine.

skylark · 05-11-2008, 02:23 PM

I really don't know what to do. The Mustang is mine as I would lose too much to sell. The adapter plates are to fit a 4.6 intake onto a 5.4 block. Speaking of which if the 5.4 sits about 1" taller exactly how mush extra height do the plates add? My SVO is like the Bullitt. Do I set a 3" piece of something soft on the intAKE AND SEE IF THE HOOD CLOSES!
I can bget that aluminum block but would have to do it this week as the sale ends friday, $440. shipped.
The plates and 8-bolt flexplate are probably about that much. I believe the rest of the mods would be labor for adapting the 4.6 oil pan and modifyingt the mid pipe, is that correct?
So the cost difference is whatever the yard wants for the 5.4 or wherever I can get one from. I cannot afford to get a $2000. block from karkraft at this time and the motor in the stang could last 2 years if driven easy, well not too hard!
What are the stock cam specs of the 5.4, anyone? How about stock 5.4 rod/piston weights?
Since I would be farming out all of the labor I need to have this done correctly. Do I have it correctly that the thread starter has a Comp 270 in his car, Colin, is that correct?
The idea of a lot more torque at 1000rpm's less than a 4.6 and the extra 50 cubes for power could allow that I remove the 4.10's for the 3.27's and have a motor that is quicker than what I have now that gets better mileage as the torquw would likely make up for the extra cubes.Just look at new stangs and the GT mileage is just a couple of MPG more than the V6's due to the extra power/torque moving the 3600lbs. that much easier.
I need some opinions from guys who hae done this mod, swap in a 5.4. I either act this week or wait until winter and see what happens with the price of fuel and other factors that are certainly out of my control. Getting the 4.6 aluminum is something I could do this week.
Really it seems a wash financially, block vrs. adapters/flexplate are about nequal, then it is the cost of the 5.4 and having my car down for some time as the 4.6 is pulled and taken apart for the crank and other parts to build the 4.6 or have a 5.4 ready to drop into the car?
I sure wish I could have a ride in a 5.4 NA and see what the difference between a 4.6 and a 5.4 is like! GUYS?

05-11-2008, 02:23 PM	#4221 (permalink)
skylark Senior Member Join Date: May 2008 Posts: 102	5.4 or 4.6? I really don't know what to do. The Mustang is mine as I would lose too much to sell. The adapter plates are to fit a 4.6 intake onto a 5.4 block. Speaking of which if the 5.4 sits about 1" taller exactly how mush extra height do the plates add? My SVO is like the Bullitt. Do I set a 3" piece of something soft on the intAKE AND SEE IF THE HOOD CLOSES! I can bget that aluminum block but would have to do it this week as the sale ends friday, $440. shipped. The plates and 8-bolt flexplate are probably about that much. I believe the rest of the mods would be labor for adapting the 4.6 oil pan and modifyingt the mid pipe, is that correct? So the cost difference is whatever the yard wants for the 5.4 or wherever I can get one from. I cannot afford to get a $2000. block from karkraft at this time and the motor in the stang could last 2 years if driven easy, well not too hard! What are the stock cam specs of the 5.4, anyone? How about stock 5.4 rod/piston weights? Since I would be farming out all of the labor I need to have this done correctly. Do I have it correctly that the thread starter has a Comp 270 in his car, Colin, is that correct? The idea of a lot more torque at 1000rpm's less than a 4.6 and the extra 50 cubes for power could allow that I remove the 4.10's for the 3.27's and have a motor that is quicker than what I have now that gets better mileage as the torquw would likely make up for the extra cubes.Just look at new stangs and the GT mileage is just a couple of MPG more than the V6's due to the extra power/torque moving the 3600lbs. that much easier. I need some opinions from guys who hae done this mod, swap in a 5.4. I either act this week or wait until winter and see what happens with the price of fuel and other factors that are certainly out of my control. Getting the 4.6 aluminum is something I could do this week. Really it seems a wash financially, block vrs. adapters/flexplate are about nequal, then it is the cost of the 5.4 and having my car down for some time as the 4.6 is pulled and taken apart for the crank and other parts to build the 4.6 or have a 5.4 ready to drop into the car? I sure wish I could have a ride in a 5.4 NA and see what the difference between a 4.6 and a 5.4 is like! GUYS?