Thread: 3.9 V8i intake manifold

They can be bought

That's what I was talking about, but didn't think I was skilled enough to make.
Added benefit of cooler manifold in theory.
Regards Philip A

I am in the process of oredering one of those. Hopefully next time I am home from work I can fit it and see if there is a "seat of the pants" difference.

What ever you do if it made 1/2 HP difference it would be unbelievable,. Try dropping the mufflers off, more noise equals more power !!! That will work well in the seat of the Pants department !!

Showing your ignorance there. HP is power, I am looking at torque.

Already have lots of noise.

Is that right BigJon , my ignorance ? Tell you what , Send me your Heads and Ill have ported to 390HP Potential , ill fit one my Crower grind Cams and your measely 180HP engine will now develop 280HP , (300HP with the right injectors/Tune) with 40% more torque at 2500 RPM and absolutely eat any standard 4.6. Cost ?
$2000 for the Head job / manifold Cut and shut , and Cam . Standard procedure for "Port Choked" engines like any of the Rover V8's
Now Bigjon , Im sure you aware of the basic Formula
Horsepower = Torque x RPM divided by 5252 Yeah ???
Then simply Torque = Horsepower s RPM divided by 5252 Yeah ?
So indeed , it is you who is the ignorant one , as quite clearly there is direct relationship between the two .
Basically for you , you cant make the engine develop more Torque , all you can do is shift where the torque is spread in relationship to RPM .

Dam 2000 for a headjob i have lived in the country to long

Ah , steve 35 , theres Head Jobs and there are head Jobs . Wha tdo you reckon a new set of stainless Valves (Up to 1.8 inlets !!!) , Inserts , springs,locks, Newen CNC Valve seats , heads shaved ,all Cost ? and thats just parts and machining ! Then theres the actual porting , pre and Post Flow benching , Porting the inlet manifold . Theres a Huge difference between a real head job and theb Junk most serve up as scratching around in the heads .

PS , most of the heads I get done ,are done in SYD-A-KNEE , a quaint little country town !!!

Originally Posted by 400HPONGAS

Is that right BigJon , my ignorance ? Tell you what , Send me your Heads and Ill have ported to 390HP Potential , ill fit one my Crower grind Cams and your measely 180HP engine will now develop 280HP , (300HP with the right injectors/Tune) with 40% more torque at 2500 RPM and absolutely eat any standard 4.6. Cost ?
$2000 for the Head job / manifold Cut and shut , and Cam . Standard procedure for "Port Choked" engines like any of the Rover V8's
Now Bigjon , Im sure you aware of the basic Formula
Horsepower = Torque x RPM divided by 5252 Yeah ???
Then simply Torque = Horsepower s RPM divided by 5252 Yeah ?
So indeed , it is you who is the ignorant one , as quite clearly there is direct relationship between the two .
Basically for you , you cant make the engine develop more Torque , all you can do is shift where the torque is spread in relationship to RPM .

Sigh...

Lots of words there.

My initial post details my thoughts. I am not trying to increase torque for free. I am interested in shifting my torque curve lower in the rev range.

You get wound up very easily.

PS.. If I send you my heads where will you fit the cam?