5.0 cylinder head flowchart. covers stock and aftermarket heads

[70torino429]

a buddy of mine sent this my way so i thought i would share it with you all. gives some good info on the flow of many popular aftermarket heads. so enjoy..

[87CrownVic]

That's a fairly nice chart, I wish I had that printed out last year.

I also found this site to be helpful for quick referencing, although I saw that a couple of them were veryslightly off. Basically the same stuff, but I thought I'd throw it out there.

http://www.carbdford.com/tech/headflow.htm

[johnunit]

Useful info


N00b question: What does the Intake/exhaust ratio effect? Is a bigger difference between intake and exhaust flow a good thing? Bad? totally combo-dependant?

[King_V]

Pretty neat stuff....

The only downside is that while they give you flow numbers, there's no real quantification of how much better/more efficient/whatever the modern heads' combustion-chamber designs are.

I don't know if there *is* a way to quantify that, though, or at least not easily.

[70torino429]

dunno really where to find info on combustion chamber differences. although i know for the trickflow twisted wedge heads they show a comparison of it compared to stock combustion chamber designs, so im assuming some other head manufacturers might have it as well, i never really thought of that. i know they show you combustion chamber size but actual design is another story

[King_V]

Yeah, the combustion chamber size will affect compression, but the shape/design can have a huge impact.

Ugh, and if you ever see a photo of the, eh, what passes for a "combustion chamber" on Pontiac heads from around 1972 or so . . yikes!!