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..
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5.0 cylinder head flowchart. covers stock and aftermarket heads
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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
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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?
85 4 door 351 Civi Crown Victoria - Summer daily driver, sleeper in the making, and wildly inappropriate autocross machine
160KMs 600cfm holley, shorty headers, 2.5" catted exhaust, 255/295 tires, cop shocks, cop swaybars, underdrive pulley, 2.73L gears.
waiting for install: 3.27's, Poly bushings, boxed rear arms, 2500 stall converter, ported e7's, etc
06 Mazda 3 hatch 2.3L 5AT (winter beater that cost more than my summer car)
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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.1987 Ford LTD Crown Victoria 2-door Coupe - perpetually "sort of" for sale...
Black with Red cloth (velour?) interior.
Purchased on 10/10/2008, with only 70,386 original miles, and only ONE previous owner.
Reader's Ride post, First pic with "new" rims, Other pics with "new" rims
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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
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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!!1987 Ford LTD Crown Victoria 2-door Coupe - perpetually "sort of" for sale...
Black with Red cloth (velour?) interior.
Purchased on 10/10/2008, with only 70,386 original miles, and only ONE previous owner.
Reader's Ride post, First pic with "new" rims, Other pics with "new" rims
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