Jeff, I have no knowledge about engines, but can tell you what I experienced first hand. I had a set of 68 #16 heads on my 428 with a fairly mild cam, and had to add 2 1/2 gallons of 108 racing fuel to a tank of 93 octane gas to keep it from pinging. I went to a set of 6 x 4 heads and have been very happy with them
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