You will gain hp and torque with ported heads in the upper rpms, and lose hp and torque in the lower rpms.

 

You're still wrong. Get a clue before you open your spout. You have no real world experience and it shows in every single post you make.

You are making false blanket statements.

Anytime you increase the cylinder head flow, you increase the potential for HP/TQ. The key is to choose a cam/intake setup that will give you good port velocity in the lower RPMs and maintain the good average HP throughout the RPM range.

You take an extreme setup like Joe Overton's NA LT1. You take the heads off that car and replace them with stock LT1 castings and look at the power/tq characteristics of the motor. Think his motor would have more torque/hp below 3500 RPMs than with the 300+ CFM heads? No.

Are there instances where your statement could apply...sure. Making blanket statements like you did is misleading to those who are new to cars and don't know any better. There are WAY too many variables involved to make such a broad statement.

 

You are wrong. You better watch what is coming from your spout!


Here is a perfect example of what I am talking about. Go to www.airflowresearch.com click on dyno tests, then Ford dyno test pkgs. The 185 heads make more power up top and less hp and torque down low than the 165 heads. Ported heads work the same way. Also go to www.andersonfordmotorsport.com Look at the GT like mine. They ported the heads and lost a ton of low end but gained a lot of top end. These are 302 and 281 cube engines very close to the 305 motor in question.

 

Using your example, the 185 CC heads were making more power and tq at 3000 RPMs than the 165 cc heads. Those two dyno comparos are two completely different setups. You're comparing the torque of a 216/224 cam to a 232/240, and you're still wrong. These two cams will have very different powerbands to start with. You need to compare different heads on top of the same cam...

If you want to use examples from the AFR site, take a look at the LS1 dyno results. The AFR 205 heads made ~ 435 tq at 4k RPMs where as the stock LS1 heads made ~ 330 rwtq at 4k RPMs. Look at the second LS1 AFR comparison. The hp/tq curves were nearly identical until ~ 2600 RPMs which is when the AFRs started to make more tq/hp and by 2800 RPM are up ~ 35 tq and ~ 25 rwhp over the stock heads.

Also, take a look at the chevy dyno page on the AFR site. There is a direct comparison between a 383 ci chevy, same cam, compression, headers, etc. The first dyno was made with AFR 180 heads and the second with AFR 195cc heads. The results below 3500 RPM are as follows:

AFR 180cc heads:

..........HP......TQ

2500....448....223
3000....459....262
3500....483....326
4000....501....381


AFR 195cc heads: (remember, identical setup)

...........HP.....TQ

2500....457....231
3000....467....273
3500....483....322
4000....511....389

These are just a few examples. As I said, there will be cases where what you said was correct, but for the most part, better heads with the right cam/intake will make more power everywhere than stock/inferior heads.

 

So it looks like we are both right and wrong. So are there any heads for my car that will gain everywhere? The ported stockers by Anderson Ford Motorsport lost a ton of low end to gain top end.

 

The only problem with you saying we are both wrong is I never said there aren't exceptions. I wasn't the one making blanket statements. I just didn't want that guy to get the wrong idea.

The only 2V dyno I see on that site is
this one . In this case, the ported heads made quite a bit more hp/tq before 3500 rpms.

 

Just let him go bowtie i can see why we look so good kickin there ***'s they just dont wanna listen they think they are know it alls but hey let them go on thinkin that they will be the ones who talk about there ***'s the rest of there life

 

Did I ever say that every single ported head on every single engine in the world would lose low end? I don't think I did. The LS1 on the airflow site lost torque down low. Look again at the graph. So you are saying sometimes ported heads will give more tq and hp throughout the entire rpm band from 750 rpm to redline? I think they will lose low end near idle.

 

Run on sentence.

You really are clueless. I don't care if the LS1 is faster than my car stock for stock and mod for mod. I would have bought one if I wanted to. I could sell the Stang anyday and get an LS1. I don't want to. I drive my car 9500 miles a year and probably race it 15 miles a year. So daily driving is more important to me.

I don't know it all, that's for sure. Who's talking about who's asses?

 

Wow you can spell but you still dont know **** about cars just bc you changed the oil is not wrenchin just wanted to let you know next time you talk about wrenchin on your dads car

 

How do you know what I know about cars? You have no idea. I've done a hell of a lot more than change oil. My buds and I are presently building a Bronco from the ground up.

 

I go from what you say on here that is up to you to. If you wanna say bull thats up to you.But so far i think you are a 16 year old kid that has done a few bolt ons and now is a know it all that is how you make yourself out to be on here.Ask anyone

 

If that isn't a generalized statement, I don't know what is. If you don't mean to make generalized statements, don't. Nobody can read your mind. I was replying to what you said, not what you meant to say.

And yes, using your (ridiculous at best) example, theoretically ported heads can make more power at 750 than stock/inferior heads. However, with any decent sized cam, the motor would run like **** at 750 rpm at WOT and your oil pressure would be so low you'd risk blowing your motor up. What's your point man?

In regards to the LS1 dyno graphs on AFR's website...your claim was you will lose hp/tq under 3500 rpm with better heads. On the LS1 graph, the tq dips below the stock headed curve for ~ 200 rpms, then is WAY above the stock headed torque curve from then until 3500 rpm (remember, the RPM the ported heads would be under the inferior head curve). The average HP/TQ below 3500 is MUCH higher with the ported heads.

You make no sense. You are like every other internet bench racer...you make statements before thinking, then, scramble to pull some lame *** piece of "evidence" out to try to cover your dumb statement. You were wrong, but that comes as no surprise to the rest of us. This is the reason you catch so much grief on this site.

 

Hey do you know who you are talkin to like that is king steve only he knows about cars it doesnt matter if you did it yourself he still read it on the net and now he did it too

 

I wish I had a link to the magazine article. It was a car like mine. They swapped heads and lost hp and torque from idle to 4000 rpm and gained hp and torque from 4000 rpm up. I was not wrong. I will get the f***ing issue and you can go find it and see. I told the 305 guy to be careful with ported heads so he wouldn't lose low end like this 4.6 motor. I never said "I guarantee all ported heads will lose low end on every motor every time." Pull your head out.