SVO heads have the same springs BUT a .532" lift cam is MAX until the needed machine work is done to the spring seat or exactly what is needed to allow high lift cams, not sure so Google or search. The SVO heads are available again but for the last time, $440, bare each. Remember they have a 51cc chamber like any npi head also. Adjustments are required for the compression you would want. Once these are sold that is all Ford is making and they will be obsolete.
I run an SVO intake on my motor which got pulled today as I am building a 2V Teksid. The new Summit heads are awesome but expect about $2395. for the price. Also expect a lot of high end and in between heads to be for sale when the TFS heads are released! It may be Hitech heads for me as $2400. is more than I can afford with a complete build and I have to finally give into LT HEADERS, AARRGGHHH! I sure hope Flowtech's quality has improved and since Holley owns the. as they do Hooker I expect some improvement. IF Anyone is/has ACTUALLY used the Flows please PM me or drop feedback here.

If I had the cash the MMR 351c.i. modular would be what i would like with a set of the TFS heads and some crazy cams soI could take advantege of the cubes and 6500rpm redline or higher I expect to run and with the 351c.i I don't know what could be done! My SVO is good for 6500rpm stock, 6800 if extrude honed. Just right for the cams I have I hope.
Anyone know the weight of the MMR $379. rods? I am using them and 4.5cc dish Probe slugs. Comporession could range from 10.3 to 11.7x depending on the head I use.

Would have done a 5.4 but the Teksid motor could not be passed up. Anyone interested in a set of 4V "B" heads? Mark

 

True. Ford wins out of those two. It's still a shame though. Audi was able to get 420hp out of a naturally aspirated 4.2L. If Ford were able to do that, think of how much more power a 5.4 could make before supercharging..

 

For the cost, its in Zo6 or GT500 territory.
Whatever floats your boat.

 

I know. That's the complete car though. I'm just referring to the engine. If Ford were to do some of the things that Audi did to that engine (minus the expensive direct injection,) they would make more power NA. They just need to raise the comp past 12:1, and create a decent rotating assembly/valvetrain setup that can run up to an 8000rpm redline. I know that will never happen, but it would certainly be nice.

 

you cant put an exotic expensive motor in a cheap car. ford is capable of 800 hp out of a 2.5liter v8 F1.

but can anyone afford it in a 30,000 car? nope.

 

Recent economical conditions, etc., have caused me to scale back my already limited budget. So.. I'm going to keep my options down to the following 2: 5.0 stroker kit with longtubes and Hitech StgII cams, or a 5.4 with cams and an HPS intake. Anyone care to give me a HP/TQ estimate for both combos? Thanks.

 

Alright... I just pulled the intake+plates and ran a bead of RTV around each port before I put them all back, got it back together and my fuel trim is still fucked up. I swapped the injector's side to side before I pulled the intake, so I guess I'm gonna start checking wiring...

I had it running maybe 10 minutes and the long term fuel trim had already hit +25 and the short term was still -10, exactly what it was doing before. I'm open to suggestions.

 

Aren't you supposed to let RTV dry for 24 hours...

 

12:1 compression isn't practical w/ our gas, especially 91 in CA. And Ford already has a valvetrain that can take 9500 rpm, just swap the springs on 4V heads for duel springs and you're set. The rotating assembly is pretty stout, just Ford couldn't cough up the cash for forged rods and pistons. The real problem is that the compression is sub 10:1 and the engines are tuned more for a truck than for a muscle car. But you are right, more compression and better cam for a better power band will make a world of difference.

 

Good point about the low octane gas. I should talk to RS4/R8 owners in Cali and ask them how they deal with that..

 

Probably but I used it in addition to the O-ring style gaskets, and its still only on one bank...
Its still beyond me as to why the Short term trim wants to pull out fuel and the long term wants to add it back in..

 

I'm sure Audi detunes the engines for use here. Heck, when I was in Croatia two years ago, my dad and I rented an Opel Astra (Saturn Astra here) and that thing got 40+ mpg (we did the entire country on one tank). However, over here, it's rated low 30's. Gotta love the low octane gas we use here...

 

That difference has nothing to do with the difference in octane rating of the fuel. There are a few factors you may not be aware of. First off, the imperial gallon is a larger quantity than the US gallon, so right away there is a boost in "MPG." Second off, there are much tighter control on exhaust emissions in the US, so that is another hit to fuel economy. And the third comes with the difference in crash-worthiness vehicles sold in the US have versus Europe, so there is typically a couple hundred extra pounds in a US-spec vehicle. All of those factors combined will net that difference you speak of. Another good example is with the new Ford Fiesta, the european diesel is rated @ 62 MPG, but when it gets "Americanized" that rating drops to about 45 MPG.

 

Yup. The Imperial gallon is 1.2 to the US 1 gallon.

 

Yes but in Europe, they use liters and when me and my dad drove the Astra, we calcuclated the mileage ourselves, converting liters to gallons. Also, octane does have something to do w/ it since the lowest you get in Europe is 95, which is equal to 91 here. Tuning a car here to run on top gas w/ more compression and timing yields not only more power but better efficiency. Plus, the Astra we were driving required 98 RON, which is about 94 here. Imagine how much more juice American cars can squeeze out if we had 100 RON (96 R+M/2) over here.

 

For a while I ran a mix of Toluene in my A6 that raised the octane rating to 98 (from 93.) There was quite a difference in performance . If my car had been force-fed, I'm sure there would have been an even greater difference. Fun stuff. If it wasn't for the loss in mileage, I'd consider switching over to E85. A car tuned for running on 104oct would be fun indeed

 

If you build the engine to run on E85 (i.e. raise the compression to take advantage of the high octane), you won't loose mileage since the engine is making more power from the same amount of fuel. However, just like how turbos can improve mileage, it only does so while you don't drive it like you stole it.

 

True. My other concern is availability though. Only two stations around here (that I know of) have E85. I'm sure there will be more eventually, but I doubt any stations will spring for pumps until after the economic issue is resolved.

 

I think the key to these 5.4's is compression and some intake work. I made 271/360 basicly untuned in a high comp(navi shortblock) with stock heads/cams NA. Made allmost double that power/tq on a 225(or so) shot of nitrous. Honestly, Id leave the cams/heads stock and work on the intake side and whats happening inside the comb chamber. Worked out great for me

 

Mine on a healty shot of gas(225 or so) would rev faster than my foot could controll it. I had the gas come on at 3000 and it litterly took about 1 second to complete the pull, if that, after the nitrous came on. However, having high compression really helped mine shine on the gas though

 

BTW, I gotta ask. WHY ARE THERE NOT MORE CARS DONE YET??? I decided to go 5.4 and was basicly done 2 weeks later with a few minor bugs to work out. Come on people! Get them done so you can kick some butt!

 

sleeping gt's is done. it's sitting at my house waiting on an ac line and him to get another break from med school. mine will get alot done in a couple weeks when i get my vacation. i work from 7am till 11pm m-f and do alot of powdercoating on the weekends. thats why i sold my intake to deke, so he can finish his.

 

Awesome!!I got the intake today!! I'll get some pics up soon.

 

first set of headers is done. pics if I can possibly squeeze them into tomorrow.

 

Alright, i realize this is an extremely vague question, and yes i have read through the thread, but what is everything i would need if i bought a bare 5.4 block? It wouldnt get finished right away, and would be put together the right way. Here is what i know i would need for it to work.

-5.4 block
-Forged rotating assembly
-rings, bearings, studs
-heads
-intake

From what i remember, all the sensors off my 4.6 will fit the 5.4. And i need to use the oil pick-up and pan off of my car. Correct? thanks for any help

 

Timing set
Oil pump
Timing cover
Valve covers that match the heads (Windsor vs. Romeo)
Bolts for all of the above
Gaskets
I'm sure I'm missing afew things

What else are you gonna use off the 4.6?

 

if you want to make it easier here is a buddies motor for sale:
http://forums.corral.net/forums/show....php?t=1068107
might be easier to just get a complete motor....

 

I would jump all over that, but i am basically broke. Thanks for the help

 

im sure its been asked before but im some what new so ...lets give what we have for a 5.4 build?? stock or built,cams,heads,blah blah blah...also dyno numbers would be great!! also please no..well my friend from 8 states away with blah blah mods put this down with these many mods. i want real world everyday mods. stock heads stock cams stock tunes..ok maybe not stock tunes( that would be nice) i want something for when people log on to SAY DAMN YOU CAN GET THAT MUCH FROM A STOCK OR DAMN NEAR STCK 5.4!!!! not everybody can swing cams heads higher compression pistons or the likes. id like to see 96-04 stangs swapped 4.6 to 5.4 motors with limited mods to let people know what they can get with the swap. so lets take it this way..im not knocking people who can spend a few grand on upgrades at one time but lets look at what LOTS of stang bangers can afford now..and i mean right now.

 

I have roughly $1200 invested in my engine
bought a 1997 5.4 from an econoline - high miles
installed new bearings, rigns, gaskets
swapped over my PI heads
bought adapter plates second-hand
bought Comp XE270 cams
stock PI intake manifold, elbow & TB
Tuned on 92 octane
265 rwhp / 330 rwtq