Originally Posted by 46Tbird
"The Coyote head at a given lift actually outflows a Yates D3 head." Now that Adam Christian, internal combustion engineering analyst, has your attention, "It's a Four-Valve, right, we're cheating [The radical Yates NASCAR race head is a two-valve.-Ed.], but up to our peak lift, 13mm, we're actually out-flowing the Yates head. And that pretty much means we're outflowing Brand X, Y, and Z."
So you are right, only up to ~.500" lift, but that is still pretty damned respectable.
http://www.mustang50magazine.com/tec...e/viewall.html
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Absolutely, but as you said its not really a fair comparo as both heads are designed in polar opposites in terms of their usage. Also one is a design from the 90's the other is 20 years newer. Take into consideration just a good valve job on a yates head will net 20-30 cfm and it out flows the coyote heads from the word go.
The heads on the new coyote engines are pretty badass out of the box but as with everything, they can be improved. Although not very cost effective when compared to nitrous or boost, when you are dealing with only 302 ci, the power number gain may not be much, but look at it on a % gain. When you can do basic hci on a coyote and make damn near 500 rwhp with a stock bottom end, that computes roughly 1.6 hp/ci thats fucking huge!!! Technology has improved so much in the past few years its crazy! I am in the process of putting together an engine package for a dirt track car. Plans are to run 302 ci old school sbf and get around 400 fwhp using stock bottom end, stock iron heads with 0 port work allowed and only using a 380 cfm carb.... talk about a challenge.. haha