Not Ranked
The intake ports are so massive on the regular cobra jet 460 heads, I've always worried about a lack of velocity on the intake side. The numbers you threw out were only a 35 hp increase, a little bowl work on the regular cobra jet heads and you'll have that beat. Individual runner F.I. on a 520 with ported cobra jet heads and you should be over 700 hp.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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