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Message: <blockquote data-quote="Ninety8stang" data-source="post: 785606" data-attributes="member: 11976">I have comp270's with a 234/238 duration and duff man up here is running them with no PTV issues at all. I hit up nick a modular head shop and he saying that im definitely going to need valve reliefs... You might try hitting them up and see what nick says but im almost 99% sure hes going to say you need some sort of valve relief.Heres the contact info if you are interested in what they might have to say . Make sure you get a hold of nick though. Hes a mod guru. <a href="http://modularheadshop.com/Orderinfo.htm" target="_blank">http://modularheadshop.com/Orderinfo.htm</a></blockquote>