Nobody, I was trying to achieve as high of compression as I could with the 318 naturally aspirated as I could and those heads had the smallest chambers so that's what I went with. I ended up getting that sucker up to 11.43:1 CR in the end. Reason I was after compression was because i was trying to do a 400hp NA build and upon some research I had found that between airflow and too low of compression normally, you can really wake those things up.