its cheaper man, and loads of torque

 

yea man, i saw your page thats sweet dude. sounds like you just had the general stuff on that 5.4, so it didn't have upgraded cams? man that thing would be a monster with pi heads and custom cams for sure thats the way i'm going

 

r3d - where did you get the head bolts and how much were they ?

 

since you already have the heads the adapters aren't much diffent in price.
also we can then see how each other do on the dyno/track between the 2...

 

not done , but almost....

 

for the cam, since the tq is so high you can balance it out a bit with a longer duration and more overlap. I'd use either a VT stage 2 or a XE270AH. I picked the 270's due to the higher lobe separation angle which eases my smog issues a bit. You're really just gunna be looking for ~.550 lift (since PTV isn't a problem with lift like that for the 5.4's) and 230+ degrees of duration at .050.

I got em' at summit. I seem to recall they were 150-190 and another 100 and coin for the main studs.
looking good man. can't wait to see some dyno numbers.

 

well the problem with that though is the 99/01 cobra intake starves even a 4.6 dohc above 7000 rpm without a shortrunner and porting...a 5.4 is going to choke over like 5000 rpm--probably going to get navi heads and a navi intake

 

the heads are the best (navi have bigger ports) but the intake isn't really designed for more than 6k rpm. I'd be really looking at a boss 290 or reichard intake. those are the best options.

 

I thought the Navi Heads were cobra heads ? Or does this rule only apply to 2v and 3v trucks/cars ?

Also R3d - I'm having no luck finding those on the summitt site. Did you have to call them in ? I'll probably try to call tomorrow.

 

the navi heads are the same as C heads except the intake ports are much larger

 

Yeah I called in for that one. Had to make sure to get the right ones.

ding ding ding. mucho bettero for t3h horsey power.

 

B heads actually have way more intake port volume though...(too big)

 

can't u just port the c heads?

 

you can but not to the point that the ports are as big as navi's, the best flowing 5.4 heads are actually the cobra R heads but they are relatively non existent and cost thousands if you actually do find a pair

 

i probably just need to put my plans on hold until i know for sure what the insurance company is going to say about my car though really

 

Kar Kraft had a set of used GT500 heads for slightly more than the cost of fully ported PI heads so you just need to shop around. However, good luck finding an intake that fits.
Also, what do mean you're talking to your insurance co? Are you going to tell them you're swapping engines because if you are, you shouldn't.

 

don't buy a motor till you know there's a car to put it in. Even brand new parts don't bring retail in return if you have to re-sell them.

The B heads can be ported to flow over 300cfm. C heads can be well ported and get close but the runner volume is kinda small for a big stroker motor like the 5.4. Navi heads are really close to R heads and a little porting goes a long way but boss 290 heads from aussie-land are basically exactly the R heads.

In any event... get whatever heads you can. C's are fine right out of the box. For intakes... I'd check out Al Papito's short runners or a reichard. they're the best things going that I've seen short of the actual R intake.

 

B heads don't have enough velocity, R heads and navi's really aren't that close, R heads have a valve train not shared with any other 4.6/5.4 motor that is a different size all together, aussie 290's are 03 cobra heads

03 cobra heads are the absolute best heads that are attainable by meer mortals(of course the ford/shelby GT heads and R heads are better but one is extremely expensive and the other is extremely expensive and impossible to find) and the fr500's are a close second, the 99/01 C heads, then B heads(except in extremely high boost and rpm which their huge port and low velocity is made up for)

as for talking to insurance company...problem is someone hit me and f'd up my car(and my back pretty bad but thats another story)...not sure if it's totaled or not(probably is) and will probably do a mod motor swap into a fox roller because a dart block is expensive...and i want >300 shot on the juice which a forged mod motor can do pretty easy with a dedicated fuel system and while rotating assy's are generally cheaper for pushrods, blocks and heads are way cheaper and stronger/better(and fox bodies weigh less and are cheaper)

 

well i hope everything works out for you sleepingGT, hope your back gets better too, i've been in that boat. My knees are still messed up from where a mitsubishi T boned me in an intersection going 70 thank god for a totally metal 89 lx thats the only thing that saved me.

 

I've noticed from most of the pics on here, but what are you guys doing with the alt. bracket? are you getting ones made or just not using them all together? all the pics i've seen of these 5.4's , none have the alt. bracket

 

I'd bet the velocity issues will be fixed by the sick high piston speeds with the B heads. They're not that great on a 4.6 but add some cubes... I dunno, what do you think. Could it make up for it. My gut tells me yeah.

300 shot! , that's ballsy. with all the weight from the 5.4L though I'd think a big block ford might be a good option. A 460 at 11:1 with a fat cam would be raunchy and you could put 2.73 gears in the car and a 2.95 1st gear tranny and be livin large. Gas wouldn't be too bad with gearing like that.

Depends on the intake manifold. If you use a stock PI intake then you should be able to use the stock bracket. Myillwillinc should probably chime in here though.

 

Are you positive ? I thought they were R heads as well.

http://www.musclemustangfastfords.co..._boss_290_gtp/

 

taht's what I've always understood. They're based on them but not exactly them. I'd bet they flow a little better than the R heads. They are a generation newer.

 

I'm going to be using a stocker and in that pic he doesn't have a bracket either , i was wondering since the stock one won't work since the intake is rased an inch..... ya know what i mean. that pic of the myillwill's engine is on the page back.

 

You could always use the stock bracket, with some longer bolts and a spacer or a few washers available from the local hardware store.

 

forged pistons, h beams and cobra crank can handle a 300 shot without much trouble--important thing is to go direct port to avoid backfire mishaps--they kill way more often than actually knocking out pistons/rods on 150 shot on even the stock 4.6 bottom end(the plastic intake only needs one small backfire and it's got a brand new window lol) and with a built bottom end and no backfires 300 shot isn't really even stressing it that much...03 cobra's with the relatively poor quality forged parts make over 700rwhp on a stock bottom end with pretty good reliability

 

Better have a really good tune dude

 

Yea thats true, i could do that and get a little piece of aluminum and get it weilded or just bolt it thanks.

 

anyone that runs >100 shot without a tune on a mod motor is


now i know plenty of people that run 150-200 on 5.0's without a tune and it runs like a raped ape but mod motors are a little more finiky

 

yea but thats why our motors run till like 200k or higher with no problems. All in the tollerances. but yea anyone that runs more is a little crazy