I'm going to be buying a junkyard 2v 5.4, around 2003-2004, and slowly build it up to a SVT Motor. I know they are essentially the same motor, minus some things like the Pistons for example. But what would benefit me the most to make more gains without the need to rob a bank? How much power can I get out of it without losing the ability to daily drive it? I plan on redoing my dear end and building the 4r70 I have now. Motor won't be thrown into the car for atleast another year or 2 after I buy the base motor, so time isn't an issue. I appreciate any help, I know a decent amount about the 4.6 and 5.4 NA, just don't know how much a supercharger changes things up as far as building up a good motor.

Thanks

It's gonna stick thru the hood, so get your sawzall out. For best chances of keeping a motor together with a blower, forged parts are best. Prolly easier and cheaper to find a cobra motor,at least it will fit under the hood. building a motor and supercharging it is never really inexpensive actually.

Yeah I was going to go with a cowl hood actually. I know it isn't ever easy or cheap, but it's an idea I like and something I wanna go for.

I don't think a cowl hood is gonna cover it. it sticks out quite a bit.



It's not a very good swap for a daily driver. better choices out there...

what I retain from this is daily driver .
If you want something for a daily driver keep thins simple and reliable. Find yourself a nice twinscrew blower 6psi and enjoy it.

Unles you want to get real serious about racing the positive displacement blowers will make a awsome daily driver without needing to throw a whole bunch of $$$$$$$$$$ on rebuilting a 5.4 or swapping a cobra motor in it.

A whipple unit or other low profile supercharger would be what you would need for a cowl hood to clear on that 5.4. Tork Tech might be your only option. Or Stock truck intake with a bbk78mm tb/plenum combo with a vortec.

But For the money time and investment for just a better daily, keep it N/A or just supercharge the 4.6 on low boost. But before you even do that, look into more aggressive gears and a tune. Sometimes Simple mods wake up a car.

Well there is a chance that by the time I build this is I will have a daily driver, so maybe a better statement would be I want something that can be street driven, not exactly a daily. I was more than likely going to do a tune and read gears, but superchargers are expensive lol. I could buy a stock SVT Lightning motor whole for the price of supercharging the 4.6 and I'll be making more power and torque with the 5.4 so that's why I'm kinda against the idea of supercharging the 4.6. Maybe if the kit wasn't so expensive it would be a different story.

What sort of budget did you have in mind for build a lightning motor, install, upgrade brakes, trans, rear end. Dyno tune as it is not just a drop and swap and turn the key and go job.

Well I know it won't be cheap, but either way I would rather do an SVT motor compared to s supercharged 4.6. Main reason being that I've seen full SVT motors with computer and harness for the same amount that I've seen the supercharger kits for our cars, so if I am going to spend the same amount of money I'd rather go for the better gain. Plus the good ol saying "there is no replacement for displacement" so I'd prefer the bigger motor and take advantage of the torque they make anyway. If I had an unlimited budget I could think of a million different motors I'd much rather go for, but unfortunately that isn't the case for anyone lol. If I remember rightly the 4.6 super charger system made about 360ish Hp and tq at the wheels. That's with a full header back exhaust and tune. I'm sure the SVT motor could pull near, if not slightly less at the wheels with a tune, and probably have a more tq, still leaving me the exhaust upgrade to be done. Of course these are only my guesstimates, but I can't be too far off I figure. If I am please enlighten me, I am here to learn after all

Mines a 4V DOHC..stock block, forged pistons/rods, Nitrided crank and I make 455rwhp..i could have more, 470-480. but did not want my tune to be on the very edge. I don't know much about a 5.4 2v other than fit is not good for the hood (the svt lightning as that pic shows above) It's not a popular swap here, I've only seen 2 maybe 3 on here. A 4.6 DOHC will easily make 400+ rwhp pending on combination of blower, pulley, exhaust.. Better plan on $6k-$8K for used stuff.if you want brand new or rebuilt, better double it. These are my rough estimates based on my experiences, your costs will vary

Thanks for that info. Nothing is solid yet but I'm sure I will figure something out. I wouldn't mind a DOHC 4.6 but most people say for the money to just do a 5.4 swap but anything is possible at this point

If you want a supercharged motor, then a DOHC 4.6 will do what the 5.4 2v easily, and fit under the hood. If you want to stay natural aspirated then it's up in the air for my knowledge of what gains the best. A 5.4 2V with a blower is not worth it to me to cut a hole in my hood when a 4.6dohc easily fits and will perform for the similar costs.

After seeing these two 04 p71 performing with these blowers around 10psi iirc running low 13,s 1.9 60' on a cold day without traction I'm totaly sold to the idea of adding a twinscrew like the saleen kit on the first picture if I ever get bored with my daily driver.

These vics were stock except for the blower and a j-mod and they hauled ass.







what I dont like about your futur built is that the word daily driver is associated with your project and you will find out real fast that it dosent belong there. The more you mod the more you sacrifice the reliability and driveability....

just my .02$

A lighting engine could fit if you use an aftermarket hood / cowl.

A stock lightning engine makes 380hp and 450ft-lbs. There are some challenges with the swap but it has been done before. Main issue is closing the hood. Like I said before, the stock NA truck intake will clear the hood with a 2 inch cowl. Or you can get spacers and use a 4.6 intake if you want to keep the stock hood, add a vortec and your done. If you can get a complete running lightning engine go for it. But start looking for aftermarket blowers if you want any sort of clearance. The above pictured car is a lightning swaped vic with a whipple supercharger pushing over 500 at the wheels.
I love the 5.4. I just hate how little support it has in the aftermarket. 2004-P71 and I are not knocking down your idea. We have both been researching the 5.4 swap for many years, I started my research back in 2004. Peir has done the swap and after the car being down for 3 years just got everything sorted the other day. If you do pull the trigger on this we are here to help. But we are just saying, be prepared to live with the headache that follows until you get the swap done.

Thanks for the help guys, that's why I like this community. Good support! Now I do like the idea of a 4v 4.6, it they were obviously less common than a good ol 5.4 2v, so what 4v 4.6 do I go for? What were they in aside from the maurader? What can I get without breaking the bank? Are there any real differences between the 2v and 4v aside from the top end being different? Knowledge is power after all lol