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Message: <blockquote data-quote="Addicted" data-source="post: 1463451" data-attributes="member: 24638">I've looked and searched for measurements on the critical "retainer to seal" clearance, and only found 2 or 3 posts from the different forums as a whole. I wanted to help out the people who may not have certain tools to be able to do such measures, and by giving somewhat of a detailed description of the process, will help who want to run more than .540" lift in the NPI heads. What we need is some custom made valve seals, I'm going to be searching for some companies that may do it. They may do it,  but say that we have to make so much at a time or we won't re-tool if they hae to. There's over .100" inside the seal between the valve guide.   Hey boostr1, do you run NPI heads on your car still?</blockquote>