[blk01gt]

what do stock p.i heads flow?? roughly

[96greengt]

Intake flow 177 cfm, exhaust flow 126 cfm roughly.

[thesource]

Damn what does the non pi head flow ???

[96greengt]

Originally Posted by thesource

Damn what does the non pi head flow ???

Less... obviously...150/150

There have been some factory freaks too on both PI and NPI, I have seen some Pis flow at (all stock), 170, but the normal is about 165/150, and as low as 126 on the exhaust side... sux for modulars too, even with PI heads. When fully ported, expect to see minimal gains, like 220/190

[Bird]

Originally Posted by 96greengt

Intake flow 177 cfm, exhaust flow 126 cfm roughly.

Pretty close - here's the flows on the stock PI's and JLP ported PI's :

Stock Heads = 176 / 143 @.500
JLP Reg. Heads= 218 / 172 @.500
JLP XR heads = 232 / 212 @.500

[thesource]

Wow no wonder the 2V suck . I wonder what the 3V heads flow because those engine feel a ton better in both throttle response and over all power even in the heavy ass S197's .

[95 GTS]

3v heads destroy 2v and they have their advantages over 4valve heads.

The livernois 3v heads are on par with ls1/ls6 heads. Their shop car was making 355 with the stage one heads, stock cams, LTs and boltons

THE DISECTION
“First off, I see the 3-valve architecture as having a huge advantage over the previous 2-valve GT head, mainly because the 3-valve provides more curtain area,” said Swain. “This is especially beneficial in low and mid lift scenarios, which is really what you’re looking for in a street car,” he continued. According to Swain, if you’re simply a peak numbers whore, the stock 2V P.I. head can be relied on for approximately 170 cfm on the intake side right out of the box. By comparison, the 3V stomps it to the tune of about 225, but as Swain pointed out, it’s really the lower lift numbers that a person wanting this procedure performed should be concerned with. “With this head and cam arrangement, I think airflow gains after around .450 lift are insignificant. The greatest gains to be made are those in the .050 to .350 range.”



To accomplish such gains, Swain puts great emphasis on a select few areas, those being mostly the unshrouding of the valves, reworking the bowls and short turn areas, modifying the valves to accommodate the better low & mid lift airflow. “The old adage is that bigger equals better, when in fact, that’s just a lot of old school theory,” explained Swain. “As it is the factory ports on these heads are almost too big. All in all, I only end up removing a couple cc’s worth the material from the intake runners by the time I’m finished—only in the critical areas.”



ON THE DYNO
On the dyno, Swain’s heads did exactly as Livernois’ claimed they would with almost 20 lbs. ft. of torque and just over 40 more horsepower to the rear wheels. The best part is that the curve is strikingly similar to stock, indicating plenty of useable grunt for the street. Now just image what these will be capable of once the aftermarket catches up!

Flow Chart-Ported 3 Valve Heads

Intake
0.200 - 188 cfm
0.300 - 237 cfm
0.400 - 253 cfm
0.500 - 274 cfm
0.600 - 282 cfm

Exhaust
0.200 - 98.5 cfm
0.300 - 138 cfm
0.400 - 165 cfm
0.500 - 176 cfm
0.600 - 182 cfm

[96greengt]

^^ now post from your own point of view ^^

Stock 2V PI heads still suck, no matter what, sure, you can get even greater cfm from these heads, but what will be the consequence??

Wanna be a flow bench numbers whore, or have proven performance with little to minor porting and bowl work, or be run of the mill and still have shitty flowing heads??

One day, someone will come out with a 'better' 2V head and it will cost all of the 2V people lots of $$$ ....

And to add more of my BS, this thread is for 2V not the 3V, which I agree, spanks the 2V hands down.

[95 GTS]

I dont understand which parts of your post are sarcasm and which parts are or are not directed at me.

I was answering this post, I wasnt hijacking,

Originally Posted by thesource

Wow no wonder the 2V suck . I wonder what the 3V heads flow because those engine feel a ton better in both throttle response and over all power even in the heavy ass S197's .

[96greengt]

^^ lol ^^

My posts are always sarcastic, you know me better then that Davis. The only true sarcastic part was the copy and paste portion from you and the 2V and 3V difference !!

The rest is all me !!

[ANRmotorsports]

Originally Posted by 96greengt

^^ lol ^^

My posts are always sarcastic, you know me better then that Davis. The only true sarcastic part was the copy and paste portion from you and the 2V and 3V difference !!

The rest is all me !!

Sarcastic and Jody nah!!!!

[95 GTS]

Originally Posted by 96greengt

^^ lol ^^

My posts are always sarcastic, you know me better then that Davis. The only true sarcastic part was the copy and paste portion from you and the 2V and 3V difference !!

The rest is all me !!

you want some pure Davis?

2v's suck, the heads suck, intake selection sucks, price per hp gained sucks. It takes a certain level of crazy to do a 2v build. You have to actually want an n/a 2v and not a fast car because we all know its cheaper and easier to buy an s trim and a set of 4.10s and an ORX and make 400 rwhp on 10 psi.

is it fun to do a gradual build? hell yes
when its all said and done will you be happy? no
Are any quick? a few but your average cammed bowtie product will put a hurtin on you.
What happens to the guys who had successful 2v builds(115+ 11 second cars)? less than 5 still actually have n/a 2vs, most learned their lesson and had a fun or miserable tme along the way.

2v heads suck, ported 2v heads are nothing that will ever make real n/a power, which limits the potential of 5.4 2v otherwise it would be a more popular swap and there would be TONs of 400+ rwhp 2v 5.4s


did ford do something good with the 3v head? yes well they have caught up with GM circa 1998. They should put this on a 302-330ci stock in later year mustangs

Its almost 2010, almost every family sedan from every producer offers a more powerful v8 or v6 than Ford's flag ship. will this change, probably not because if it aint broke, dont fix it. The mustang sells and the all out enthusiest is not its target market. I think they know how to design better but they just dont care enough.

[thesource]

Originally Posted by 95 GTS

I think they know how to design better but they just dont care enough.

Of course they do but Ford has always been a lame ass in this department . Look at the early years . GM slapped a 4 barrel carb on just about anything from a V6 to a 454 . They offered superior heads and intakes . They kept stuff interchangable . Hell even the Mopars would stomp a mud hole in most factory Fords up until the mid 80's .

I am a die hard Ford guy but if it were not for the Fox body 5.0 efi Mustang to have come along , Ford + performance would not be where it is today because the aftermarket would have never done anything Ford related .

I have nothing against mod motors but they are way over priced and under perform in the dollar - performance ratio . The LSX engines are far superior in just about ever aspect in stock trim or even mildly modified .

[96greengt]

I agree...

but here is the kicker... my engine build did not cost me a dime of my own money to build and I built it myself minus the machine work. I found old parts, items, traded, e-bay'd my ass off, bought and sold to build my expensive ass motor. Am I happy, yes, cuz I did it myself, I did not pay someone to do it for me. Am I happy with my HP numbers, yes and no. I was expecting at least 20 more HP, but how many people do you know with a built 2V N/A that puts 300 hp the the ground??

[95 GTS]

we did a stock 96 with pi heads that made 302/321 with vt stage 2s, It was just totalled by a wheel that sheared off the lugs.

I personally know about 5 people... not speaking about random internet "friends"

Your build has a definite cost. I traded my ass off as well for my setup. I was in college and had no money whatsoever. I barely spent any money and traded and sold parts that came on the car when I bought it. I know where you are coming from.

[96greengt]

Just a PI swap and cams and it made that power?? I am assuming it had more bolt ons....

[95 GTS]

accufab plennum/tb
steeda pullies
hooker LTs and orx
magnaflow catback
24s
3.55s
PI heads and intake
vt stage 2 cams with lunati springs
stock intake and maf with a k&n
xcal 2 from modular depot
10.5 inch cobra rs with 315 nitto 555Rs