Wasn’t referring to you directly but then again your mention of clearance must have triggered me as the valve/guides clearance has been mentioned in the past among various comments by others over the past couple years in various threads. I know your opinions on the heads from previous posts you’ve made. I agree they are an ootb head. Eye ball em, slap em on. I run them, initially ootb and then swapped springs later on. I know a little bit about the ones I have, including usage over time. Mine are holding up just fine.:thumbsup: