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Are there any differences between the D0OE heads and the E7SE heads? Other than the seats in the D0 heads are not hardened ?

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the D0 302 heads are 58cc on paper, the E7's are 63-65 iirc
 

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So if I am using flat top pistons, my 70 heads will be much better than the E7 heads right?
the valve size for sure, and the ports are the same size, so you would get a little bump in compression with the early heads.
 
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