[Rench]

How many of you guys are running ported heads with bigger valves and what kind of gains are you seeing...........

[07stanggt]

There are no N/A guys on this website running heads with bigger valves. I think 05kbcharged might have livernois stage III heads with oversized valves but he is stroked, bored, blown and i dont think he did the heads alone to know what they specifically gained him.

I saw about 30hp with livernois stage II heads.

Probably better to call livernois, JDM, or JPC, Justin has built a few n/a 3vs and will know what the specific gains were with the bigger valves.

[unlicensed to drive]

The bigger valves are usually for serious strokers/FI cars. Its not worth paying 800 more(stage 3 over 2) bucks if they wont make a large difference.

[forensicsteve]

Just installed Livernois stage 3 heads and 3spr cams. Car is at tuners but they are doing some other stuff before any dyno pulls...so no results yet. Car has very very limited street use. Not used for transportation anymore.

[JakeM]

Originally Posted by mustangfan123 The bigger valves are usually for serious strokers/FI cars. Its not worth paying 800 more(stage 3 over 2) bucks if they wont make a large difference.

How the FRICK do you know this? Do you even know the purpose of going with larger valves? LoL

[Mickey]

MF, what did we say about advice....if you don't know what you're talking about, don't say it

[germansheperd]

Ported heads here with stock size valves. I guess depending on the combo people will see 20-30 RWHP.

[germansheperd]

Originally Posted by mustangfan123 The bigger valves are usually for serious strokers/FI cars. Its not worth paying 800 more(stage 3 over 2) bucks if they wont make a large difference.

+1 not going to make much of a difference on N/A strokers either but to each his own.

[JakeM]

You don't get larger valves for performance reasons guys. Larger diameter valves with larger diameter stems take more heat and abuse. Thats why you get larger valves. Or if you are getting some crazy heads you need the larger valve to cover the larger opening. Another function of larger valves is to better atomize fuel because they hold more heat. But that is arguable.

When your looking into larger valves it should be reliablity sake. Not performance. You will not see a increase in performance from larger valves.

[Rench]

I'm just thinking ahead to my winter project. Here's what I'm thinking, if I'm going to go through the trouble of swapping the heads (definitely more work than the the good old windsor motors) I may as well throw a stroker rotating assembly in while I'm at it. If I'm going to do that may as well go with the bigger valves. Shoot, while the engines out why not tack a 6060 on the back of it....Well, you get the idea. Anyway, I was curious to see if anyone sprung for the bigger valves. Rich, 30 HP is decent, I geuss that's not bad for a weekend project on these cars. Ford did a great job on these 3V's. Tough to improve on.

[TheUNZippee!]

The purpose of larger valves it to allow for more air flow, to get more air/fuel mixture into the combustion chamber, and to get more out because you put more in. It's for performance.

[UrbanRedneck]

Originally Posted by TheUNZippee! The purpose of larger valves it to allow for more air flow, to get more air/fuel mixture into the combustion chamber, and to get more out because you put more in. It's for performance.

+1. While the things towelly said are correct also, larger valves allow for more airflow (given that the ehad is properly modified to accomodate them) and hence can support higher HP. But I think that the general idea is that the valves on the stock heads are large enough to flow as much air as the small engine is capable of drawing in without forced induction anyway.

[TheUNZippee!]

Yup.

[JakeM]

Larger Valves don't make for more air flow. Large valve OPENINGS like in ported heads do. But Larger valves are just plugging the same whole with a larger valve. Am I missing something?

[unlicensed to drive]

Originally Posted by Mickey MF, what did we say about advice....if you don't know what you're talking about, don't say it

Damn Mickey, I know what I'm talking about, I've heard this stuff before, even germansheperd agreed. But yes the bigger valves take more heat, and why do you think most people who buy them have BUILT cars? Because they need the better heat resistance. Even if my info is not 100% accurate at least I'm trying to help. If everyone was scared as hell that their information was inaccurate, they wouldn't post any.

[JakeM]

Originally Posted by mustangfan123 Damn Mickey, I know what I'm talking about, I've heard this stuff before, even germansheperd agreed. But yes the bigger valves take more heat, and why do you think most people who buy them have BUILT cars? Because they need the better heat resistance. Even if my info is not 100% accurate at least I'm trying to help. If everyone was scared as hell that their information was inaccurate, they wouldn't post any.

Larger Valves in of themselves dont' make for any real gains in performance. Which is what you were saying.

[unlicensed to drive]

Yeah I meant they don't make much difference for performance, so if performance is why people are opting for them, then they're wasting $800

[2006greyGT]

you two play nice....

I am not sure why but we upped the exhaust valves by 1mm when I did my build... I trust my shop and just let them drive the build..

[TheUNZippee!]

Originally Posted by Towelly Larger Valves don't make for more air flow. Large valve OPENINGS like in ported heads do. But Larger valves are just plugging the same whole with a larger valve. Am I missing something?

One would assume that when you go for a head with larger valves that the opening would also be larger.

[unlicensed to drive]

Well the oversized valves go well with your application 2006greygt.