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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Thanks for all of your responses. We are going to add 0.030 shim to give 1.625 in spring height with valve on seat for a spring pressure of 95 lbs. At valve full open with .342 max cam lift and 1.5 rocker arm ratio with a 0.016 valve clearance setting (Kastner G3 cam) we should get about 244 lbs. of spring pressure with the maximum valve lift of 0.497. At least that is what I calculated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>As a note, I did get some valve float at about 6200 to 6300 RPM at Elkhart Lake last Fall with the 85 Lbs. of seat pressure when I went over our max RPM of 6000 trying to get past a Volvo.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Tim Murphy<o:p></o:p></p><p class=MsoNormal><a name="_MailEndCompose"><o:p> </o:p></a></p><span style='mso-bookmark:_MailEndCompose'></span><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> timmmurphh@gmail.com [mailto:timmmurphh@gmail.com] <br><b>Sent:</b> Tuesday, February 14, 2017 1:56 PM<br><b>To:</b> fot@autox.team.net<br><b>Subject:</b> valve spring pressure on TR4 race engine<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have 85 lbs. pressure on the intake valve with the valve closed and it sits at a height of 1.655 inches. At .400 lift, I have 190 lbs. of pressure. We only run to 6000 RPM with the gearing we have and the engine we have. The valve springs are double springs and the machine shop says they are all about the same, very consistent. What pressures would be recommended? The machine shop thinks these pressures are light for a 6000 RPM engine. Any advice will be appreciated. Thanks.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Tim Murphy<o:p></o:p></p><p class=MsoNormal>1961 TR4 #317 BRG<o:p></o:p></p></div></body></html>