67firebird. Yes those are 670 heads. I needed more cc's. After looking at alum heads, I figured it must not make a huge difference in what shape to make these. I did put some thought into, though. Even the 061's are very different and some say they work great.
GRX. These heads were sitting for 20+ years, I did not want to spend any money on another set and I have read that they are the best low lift flowing D-port. I ported these using Pete M's video. A 1.72 shaping valve, which is 1.58 window width. Quite a bit smaller than Jim H's 1.69 dimension at the short turn. The flowed 164@.200,214@.300, 240@.400,250@.500. So yes, I think they were worth the time.
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