[assasinator]

ok so you guys are accepted by me as hp gurus with the 4.6 in a streetable package.

i have this indiviual we will call him BSporter, claiming in the tamps area they have 5-6 350 rwhp stangs driving around, and that 370 rwhp is readily available with this "GUY" down there porting heads that all of the fast N/A cars are running.

he mentions 55 degree seat and valve margin angles as the key to big flow with 2v. he says hand ported by this'guy' is all it takes with other bs combo stuff.

i call BS, but have you guys ever heard of such a thing?


have you heard of some head mand in tampa setting the world on fire?

thanks. -bill

 

[guy1138]

I'm by no means a 4.6 guru, but the stock HP of the 07 4.6 is 300.

I think you COULD get to 370 rwhp with an NA motor, but it would take more than a port & polish and a valve job.

What's the "other bs combo stuff". I'm thinking to get to that level you'd need a lot more: cams, intake, pistons for higher compression, injectors, killer programming @ 93 octane, headers & exhaust w/ cats eliminated
Plus all of the little horsepower scavengers, like CAI & under-driven pullies.

General hot-rodding knowledge says that while you can get good HP gains from doing head work, it's generally not a stand alone solution. It allows more air to get into the engine, sure, but it's air that your engine needs because it has been bored, stroked & cammed.

 

[assasinator]

i'm talking 4.6 2v not 3v.

 

[General Zod]

i have this indiviual we will call him BSporter,

well since you have him, why not ask him for cylinder head flow data, along with all the other pertinent information, and some dyno graphs?

 

[GreenBird]

Ken B's stock bore/stroke 2v made 368rwhp. But he had race ported heads, race cams, and was turning upwards of 8000rpm. So yes, it is possible. IIRC, Ken used Fox Lake for the heads and Comp for the cams.

 

[ThunderBeast86]

Well you said nothing of it being a STOCK SB...so more compression, damn near perfect porting, a solid cam with springs, and an intake to breathe well, headers to get all the air out, and a rock solid tune. I say it's possible, but a bunch of them driving around? Doubt it. Plus it'd be way cheaper to throw a blower on there. These mystery cars would probably have famous owners/or PorterBS would be more well known if he's designing the fastest NA streetable 2v 4.6's.
370fwhp sounds a lot better if the guy actually knows how to port, and the cars have cams and a solid tune.

 

[ThunderBeast86]

Oh, and this guy does the "porting for all the fast cars down there," that right there is some nonsense, he just wants you to get your heads from there. I don't know anyone who can do heads better than Al Pappito or Fox Lake......THEY do the porting for the fast cars.

 

[BIG PETE]

Pretty tame big bore DOHC's have done it, many from 2 years ago, but...

I don't know if you could get that kind of flow out of a 2v head and still have good valve support. I would not be surprised if that porter gets those extra CFM by cutting out the valve guides (taking plays from Patriot Performance's book).

Also, you would need a ton of RPM / cam, not to mention an electric water pump and only turning the alt with a short belt via the electric pump's pulley. Sticking with the stock bore makes that 370 rwhp goal extremely difficult too, especially since you want it to be streetable (good start and idle behavior, running all accessories, etc).

I'm not saying it's impossible, but if you are going to use a 2v head with a stock bore... I question the headwork done and the practicality of that engine in a true street car.

Pete

 

[AnthraxBird]

Anything's possible with a lil money, and a little imagination. =)

 

[miller1995]

I know Tydlwavs' old car with a stock PI motor, Bullit intake, and Vortec made 370 rwhp so, yes it is completely believable.

-Miller

 

[BIG PETE]

I know Tydlwavs' old car with a stock PI motor, Bullit intake, and Vortec made 370 rwhp so, yes it is completely believable.

-Miller

With boost that kind of power is not difficult to get; however, doing it NA with a 2v head is another story...

Pete

 

[miller1995]

With boost that kind of power is not difficult to get; however, doing it NA with a 2v head is another story...

Pete

Woops did not see the N/A part...

 

[twin turbo 281]

I belive it but dosent mean hes the greatest head porter. Hes saying stangs running around with 370rwp but isnt mentioning all the things that have been done. PI motor sees 260 or so at the flywheel. So thats a gain of maybe 130 if its a stick? Higher RPM intake,wild cams and valvetrain, good flowing heads, a raise in compression,good flowing exhaust,stand alone,and the other little bolt ons you could gain that much its possible.