http://www.ronsraceshop.com/companie...eng_fordSB.php.

 

This does not require any mods to the block or any special cams right?

 

Don't know for certain. But from what I understand, I'd have to say no.

 

I've seen those before on arao engineering's website. I'd consider them if they weren't so expensive.

 

Figured they are very pricey. Hello overtime.

 

I remember seening a similiar head years ago for use on the Hemi blocks. I dont think it ever went anywhere. I also dont remember who built it. I remember it was 4v hemispherical. I really didnt see the point since you can put such huge valves in a hemi in the first place.

 

Four smaller valves will produce much more low end power over larger valves which really have to see high rpm's to make power. So the four smallers valves still offer better flow and power through out the rpm range or at least thats the theory of it. Look at the engines being built today and you will see that this is a norm for engines now.

I to have known of these heads but have yet to see or read about some using them other than what the comapny list about them.

 

Port velocity and stroke has more to do with low end torque than whether it's a 2 or 4 valve design from what I understand.

 

If you try to get the same flow from a two valve head as you would from a four valve head the two valve head would have poor velocity at low rpm compared to the four valve head so this is a direct effect on port velocity.

 

Can you imagine the argument you could develop, trying to argue with a purist that you infact have a 4 valve "per cylinder" windsor motor under your mustangs hood or other windsor equipped vehicle.

So how much do those heads run? Would it be more "cost effective" to just install a low mile mod motor?


Later

 

Yeah it'd probably be cheaper to build a 4 valve mod. A wild guess is anywhere from 3-5k for the arao's. A 32 valve 400 or 427 is music to my ears. Just when I decide on a 2 valve head, these bad boys pop up. More homework to do.