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AndyF, I have read your articles and others and didn’t want to get too optimistic. But these heads really do make serious power.
There was easily more In it. Vacuum through the carb was 1.9” and afr was 13.5. Through mufflers. I decided to stop there since I won’t be using that carb anyways. 2” spacer gained 5hp over the 1”. 38 timing over 36 only gained 1hp. BSFC was very impressive down into the 300s. Didn’t mess with valve lash or anything other than timing and spacers. Last run we cooled it down to 120 degrees.. Thats when
we made 743hp@6100 and 700tq@5000