Found this site on the web and it has the installed valve height for some mid fifties olds engines.If you are installing hardened seats,you will know that this info is hard to come by. Just try looking. Wrong height,engine suffers. I hope that the owner of the site will not mind sharing this and my apologies if I've strayed off course-my intentions are good. <TABLE cellSpacing=0 cellPadding=0 width=582 border=0 NOF="LY"><TBODY><TR vAlign=top align=left><TD><TABLE cellSpacing=0 cellPadding=0 width=445 border=0 NOF="LY"><TBODY><TR vAlign=top align=left><TD></TD><TD width=7></TD><TD></TD></TR><TR vAlign=top align=left><TD height=4></TD><TD vAlign=top align=left width=73 rowSpan=3><SCRIPT language=JavaScript><!--function onPictureRollover1A45Over() {}function onPictureRollover1A45Out() {}//--></SCRIPT><SCRIPT language=JavaScript><!--graphic1PictureRollover1A45 = new Image()graphic1PictureRollover1A45.src = '../../../rocketrider_regular.JPG';graphic2PictureRollover1A45 = new Image()graphic2PictureRollover1A45.src = '../../../rocketrider_open.JPG';function onPictureRollover1A45Over() {do***ent.PictureRollover1A45.src=graphic2PictureRollover1A45.src;}function onPictureRollover1A45Out() {do***ent.PictureRollover1A45.src=graphic1PictureRollover1A45.src;}//--></SCRIPT></TD><TD colSpan=2></TD></TR><TR vAlign=top align=left><TD height=61></TD><TD></TD><TD vAlign=center align=middle width=360></TD></TR><TR vAlign=top align=left><TD height=7></TD><TD colSpan=2></TD></TR></TBODY></TABLE></TD><TD><TABLE cellSpacing=0 cellPadding=0 width=137 border=0 NOF="LY"><TBODY><TR vAlign=top align=left><TD width=13 height=13></TD><TD width=124></TD></TR><TR vAlign=top align=left><TD></TD><TD cl***=TextObject width=124>Back to Main Page Previous Chart Next Chart</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=0 width=591 border=0 NOF="LY"><TBODY><TR vAlign=top align=left><TD width=591 height=4></TD></TR><TR vAlign=top align=left><TD cl***=TextObject width=591>Valve Specifications</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=0 border=0 NOF="LY"><TBODY><TR vAlign=top align=left><TD width=9 height=8></TD><TD></TD></TR><TR vAlign=top align=left><TD></TD><TD width=579><TABLE id=Table4 cellSpacing=1 cellPadding=2 width="100%" border=1><TBODY><TR><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=26 rowSpan=2>Year</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=32 rowSpan=2>Model</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" colSpan=2>Valve Lash</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" colSpan=2>Valve Angles</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=40 rowSpan=2>Valve Spring Installed Height</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=66 rowSpan=2>Valve Spring Pressure Lbs @ In</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" colSpan=2>Valve Lift</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" colSpan=2>Stem Clearance</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" colSpan=2>Stem Diameter</TD></TR><TR><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=23>Int.</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=21>Exh.</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=24>Seat</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=26>Face</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=21>Int.</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=22>Exh.</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=58>Intake</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=63>Exhaust</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=29>Int.</TD><TD style="BACKGROUND-COLOR: rgb(0,51,153)" width=27>Exh.</TD></TR><TR><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>1953</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=32>All</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=23>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=24>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=40>1 53/64</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=66>156@1 15/32</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>.366</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=22>.366</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=58>.0022-.0042</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=63>.0027-.0045</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=29>.3421</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=27>.3934</TD></TR><TR><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26 height=19>1954</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=32>All</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=23>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=24>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=40>1 53/64</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=66>156@1 15/32</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>.366</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=22>.366</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=58>.0022-.0042</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=63>.0027-.0045</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=29>.3421</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=27>.3934</TD></TR><TR><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>1955</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=32>All</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=23>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=24>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=40>1 53/64</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=66>156@1 15/32</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>.403</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=22>.403</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=58>.0022-.0042</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=63>.0027-.0045</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=29>.3421</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=27>.3934</TD></TR><TR><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>1956</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=32>All</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=23>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=24>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=40>1 7/8</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=66>190@1 31/64</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>.418</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=22>.418</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=58>.0017-.0040</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=63>.0022-.0045</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=29>.3421</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=27>.3934</TD></TR><TR><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>1957</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=32>All</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=23>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=24>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=40>1 53/64</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=66>190@1 31/64</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>.419</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=22>.435</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=58>.0017-.0035</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=63>.0022-.0040</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=29>.3421</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=27>.3934</TD></TR><TR><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26 height=13>1958</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=32>All</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=23>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=24>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=40>1 53/64</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=66>227@1 7/16</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>.435</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=22>.437</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=58>.0017-.0035</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=63>.0022-.0040</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=29>.3421</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=27>.3934</TD></TR><TR><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>1959</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=32>All</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=23>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>Zero</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=24>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=26>45</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=40>1 53/64</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=66>175@1 7/16</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=21>.419</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=22>.435</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=58>.0017-.0035</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=63>.0022-.0040</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=29>.3421</TD><TD style="BACKGROUND-COLOR: rgb(102,204,255)" width=27>.3934</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=0 width=588 border=0 NOF="LY"><TBODY><TR vAlign=top align=left><TD width=9 height=37></TD><TD width=276></TD><TD></TD><TD width=278></TD></TR></TBODY></TABLE>