<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">As a result of my broken timing chain, all but one of the valves are bent. Since I still race SCCA, I need stock diameter (head diameter) valves. The stock diameter valves do not have the stems necked down for better flow. When i built this head years ago I bought the oversized valves with necked down stems and ground them down to stock diameter. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">My question for this esteemed group is - Does someone make or sell stock diameter valves with 5/15 inch stems that are necked down for better flow? I was thinking I might need to have Manley make a custom set? </div><div dir="ltr" data-setdir="false">JoeB</div></div></body></html>