Tom, I am now using a stock head with welded in dividers before and after the stock head bolt, also in the intake. but I needed over 30 psi to make the same HP. I felt I had to seal mine since I use carbs, you may not need to since yours is injected. Hope I yours works, as good as mine did all the plugs look the same.
Still fighting an issue with mine hope to have it at the covention.
