My KRE Dport 455 engine runs fine at 11.56-1. I know these heads have the modern chamber so not quite apples to apples comparison. The engine also has a huge solid flat tappet cam shaft. If I finally get to run the car at the track I will add some 110 just to be safe. I do some spirited street driving and haven’t had an issue now that I have seen on my plugs.
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67 Firebird 467 cubic inches 7.71 @ 92 in the 1/8 and 11.69 @ 115 in the 1/4.
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