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1.7 vs 1.6 for a tfs1 cam
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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>jaejae</b> <br /><small>Member # 7958</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(2010,6,22,3,7,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> already have the 1.6's would i benefit from 1.7's? <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>68stanger</b> <br /><small>Member # 7842</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(2010,6,22,3,16,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> will it clear your pistons? are they notched or aftermarket? <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>jaejae</b> <br /><small>Member # 7958</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(2010,6,22,3,21,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> not sure asking you guys <img border="0" title="" alt="[Wink]" src="wink.gif" /> ..stock pistons <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(2010,6,22,12,4,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> You have to check to see if they clear. No one here ('cept for maybe Duncan Motors) knows how your motor is built. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>JohnB</b> <br /><small>Member # 969</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(2010,6,22,12,39,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> Stock shortblock, GT40 heads, .043 head gasket, and that cam with 1.7's will leave you with .125-.130 clearance exhaust side...enough to live, as long as your springs are up to the task. Doublecheck to make sure your valve guides/guide seals aren't bottoming out on the spring retainers. This is a common problem with GT40's and any cam lift over .540. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>jaejae</b> <br /><small>Member # 7958</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(2010,6,22,14,45,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by JohnB:<br /><strong> Stock shortblock, GT40 heads, .043 head gasket, and that cam with 1.7's will leave you with .125-.130 clearance exhaust side...enough to live, as long as your springs are up to the task. Doublecheck to make sure your valve guides/guide seals aren't bottoming out on the spring retainers. This is a common problem with GT40's and any cam lift over .540. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">thats what i was really worried about john..duncan has mentioned that to me before..the valve springs are good up to .542 <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>nitrous_bob</b> <br /><small>Member # 77</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(2010,6,22,16,17,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> tfs told me i'd hit with my 1.9/1.6 eddy heads using a 1.7 rocker for sure, and that i should clay them even with 1.6 rockers on that cam. thats the 200001 or whatever right ?<br /><br />i'd call them and ask. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>copcar</b> <br /><small>Member # 10113</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(2010,6,26,1,16,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> The 1.7/Stage 1 cam is a known combination but no matter what check your clearances. Also, your heads do not flow any better at the lift the Stage 1 is providing with 1.6's versus 1.7's. Typically, even with a spot on port and valve job the GT40's cap out around 520 lift. I just don't think you will get your hp/dollar worth by installing them. Typically that combo is seen on FAC 170's, AFR 185's and 165's. The GT40 valve springs will handle the lift just fine, however due to the ramp rate of that cam I would keep the revs under 6500. It is very easy to float a valve with that cam and those springs if you are not careful. <br /> </font> </td></tr> <tr bgcolor="#dedfdf"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>jaejae</b> <br /><small>Member # 7958</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(2010,6,26,5,47,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> </font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by copcar:<br /><strong> The 1.7/Stage 1 cam is a known combination but no matter what check your clearances. Also, your heads do not flow any better at the lift the Stage 1 is providing with 1.6's versus 1.7's. Typically, even with a spot on port and valve job the GT40's cap out around 520 lift. I just don't think you will get your hp/dollar worth by installing them. Typically that combo is seen on FAC 170's, AFR 185's and 165's. The GT40 valve springs will handle the lift just fine, however due to the ramp rate of that cam I would keep the revs under 6500. It is very easy to float a valve with that cam and those springs if you are not careful. </strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">the heads have been ported pretty much to the max,they have upgraded trickflow valve springs,hardend valve seats,3 angle valve job.. <br /> </font> </td></tr> <tr bgcolor="#f7f7f7"> <td valign="top" width="18%"> <font size="2" face="Verdana, Arial"> <b>Stan G</b> <br /><small>Member # 6226</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(2010,6,27,16,59,0), dfrm, tfrm, 0, 0, 0, 0)); </script><hr /> </font> <font size="2" face="Verdana, Arial"> I doubt you will see 5 additional hp. <br /> </font> </td></tr> </table></td></tr></table> <br /> <br />
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