<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I know I’m working with a very different engine - GT6 - thus smaller valves, but the closed seat pressure is 65 lb and the open pressure is 233 lb at 0.53” lift. This is per the cam designer. <div class="">I’ve been running similar seat pressures for years, shifting at 7,000 RPM</div><div class="">I would defer to the cam specs/designer.</div><div class=""><br class=""><div><div class="">On Feb 14, 2017, at 3:49 PM, MadMarx via Fot <<a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Verdana-Bold; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Verdana, sans-serif; color: rgb(31, 73, 125);" class="">These are very light springs.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Verdana, sans-serif; color: rgb(31, 73, 125);" class="">I would run 250 seat pressure and 500 at full lift.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Verdana, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Verdana, sans-serif; color: rgb(31, 73, 125);" class="">Cheers<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Verdana, sans-serif; color: rgb(31, 73, 125);" class="">Chris<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" style="font-size: 10pt; font-family: Verdana, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div class=""><div style="border-style: solid none none; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding: 3pt 0cm 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">Von:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class=""><span class="Apple-converted-space"> </span>Fot [<a href="mailto:fot-bounces@autox.team.net" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">mailto:fot-bounces@autox.team.net</a>]<span class="Apple-converted-space"> </span><b class="">Im Auftrag von<span class="Apple-converted-space"> </span></b>timmmurphh--- via Fot<br class=""><b class="">Gesendet:</b><span class="Apple-converted-space"> </span>Dienstag, 14. Februar 2017 20:56<br class=""><b class="">An:</b><span class="Apple-converted-space"> </span><a href="mailto:fot@autox.team.net" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">fot@autox.team.net</a><br class=""><b class="">Betreff:</b><span class="Apple-converted-space"> </span>[Fot] valve spring pressure on TR4 race engine<o:p class=""></o:p></span></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">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 class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">Tim Murphy<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="EN-US" class="">1961 TR4 #317 BRG<o:p class=""></o:p></span></div></div><span style="font-family: Verdana-Bold; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_______________________________________________</span><br style="font-family: Verdana-Bold; 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