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(PTV) piston to valve clearance
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<table border="0" cellpadding="1" cellspacing="1" width="99%" align="center"> <tr bgcolor="#000000"><td> <table border="0" width="100%" cellpadding="3" cellspacing="0"> <tr bgcolor="#000099"> <td colspan="2" align="left"> <font size="2" color="#ffffff" face="Verdana, Arial"> <b>T O P I C R E V I E W</b> </font></td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>1fastmach1</b> <br /><small>Member # 10137</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2016,9,12,12,4,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> just got my new heads came with 2.110 valves so i clayed the pistons with playdoe and set my valve lash at 0 and rotated motor over and checked had .094 on the intake and .086 on the exhuast is that good or need more clearance its a sbf windsor solid roller <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>wilit</b> <br /><small>Member # 3367</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2016,9,15,21,44,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> You generally want a minimum clearance of .080" on the intake and .100" on the exhaust. Some cam manufacturers say .100" on the intake and .125" on the exhaust. Either way, your exhaust side looks a little tight. You could either use a notching tool like <a href="https://www.summitracing.com/parts/isk-pnt-218" target="_blank">this,</a> or if you're running 1.7 ratio rockers, you could drop down to 1.6's. <br /><br />You might be able to advance the cam to gain clearance. Advancing the cam will increase your exhaust clearance but decrease your intake clearance. Normally 1 degree will gain you .010" of clearance. So in your case you could get your intake to .084" and exhaust to .096". That'd be close, but finding a timing set that will advance or retard in 1 degree increments is going to be expensive. Most timing sets advance or retard in 2 or 4 degree increments. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>[SHO]TIME</b> <br /><small>Member # 8962</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2016,9,15,21,51,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> did you have your head torqued on with a gasket installed when you took those measurements? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>1fastmach1</b> <br /><small>Member # 10137</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2016,9,18,9,2,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> yes head was torqued down and already running 1.6 ratio rockers so thoose specs are to tight you think changing head gasket thickness hould work also right<br /> <br /> <small>[ 2016-10-18, 12:42 PM: Message edited by: 1fastmach1 ]</small> <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>wilit</b> <br /><small>Member # 3367</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2016,9,18,22,34,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> You can stack an MLS gasket to get some extra clearance, but it's not something I personally would do. The extra .020" you'd need will lower your compression ratio. Not by a lot, but for example, if you had a 9.3:1 with a .039" gasket, you'd bump down to an 8.9:1 with a .059" gasket. More importantly though, you create a greater chance of blowing out the head gasket. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>1fastmach1</b> <br /><small>Member # 10137</small> </font></td> <td width="82%"> <font size="1" face="Verdana, Arial"> <img src="https://californiafords.com/ubb/posticon.gif" border="0" alt=" - " /> posted <script language="JavaScript1.3" type="text/javascript"> document.writeln(timestamp(new Date(2016,9,20,8,16,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> ok well used a .043 mls head gasket from fel pro and now have .100 on the intake and .090 on the exhuast think that will work any thoughts or still to tight have brand new valve springs and will change every off season <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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