High CR cnc'd 241 vs cnc'd 243?
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Jason
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I would speculate that most peak and average difference between the two heads would have to do with cam selection and header design/size. I bet an apples to apples comparison with a mild cam (say my hotcam which is nothing radical and has a small lift (.525") would show similiar results. As duration and lift get bigger, I bet the 243 shows some advantages, but for mild, I bet the 241s hold their own.
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Ported 243s will make more power. I never knew why. For the longest, the answer was "just because".. but I asked the right people and was directed to some pictures. You can see why the 243 flows better. It doesn't have that sharp turn before the valve, rather a smooth turn.
Left is 243 right is 241
![](http://www.c5registry.com/documents/ls6/images/LS6%20images/407B_8.jpg)
![](http://www.c5registry.com/documents/ls6/images/LS6%20images/407B_9.jpg)
Left is 243 right is 241
![](http://www.c5registry.com/documents/ls6/images/LS6%20images/407B_8.jpg)
![](http://www.c5registry.com/documents/ls6/images/LS6%20images/407B_9.jpg)
![](http://www.c5registry.com/documents/ls6/images/LS6%20images/407B_10.jpg)
Last edited by HoLLo; 01-12-2012 at 12:19 AM.