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Originally Posted by David R.
What are the advantages to having the high compression heads? What kind of improvements do you achieve in performance? I am currently going through my AA engine. Are there any drawbacks from deviation from stock head?
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Considered against the range of compression ratios used in the auto industry in the '30s, it would be more accurate to describe the "high compression" 6:1 heads as "normal compression" and the stock head as "low compression." I've never heard anyone report operational issues with the 5.5 or 6.0 heads.