<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">FoT,<div><br></div><div>As a follow up to my request for information last fall regarding my head gasket failure at RA, I wanted to share my findings. Turns out that the ARP head studs did stretch! They were more than ten years old. Replaced them over winter and all was well last weekend. It was a cool weekend when we ran so the engine was making lots of power to fully stress the studs. The new O2 sensor indicated that we were running on the rich side of center.</div><div><br></div><div>Lesson learned: Measure and mark each head stud. Keep a record. Re-measure at each rebuild. Replace when they exceed the measured tolerance. </div><div> </div><div>We also re-torqued the studs after a heat cycle. ALL turned 1/8 of a turn on the re-torque.</div><div><br></div><div>Thanks to the many who offered their insights and assistance on this problem.</div><div><br></div><div>Best,</div><div><br></div><div>Allen</div><div> <br><div> <div><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica"><b>Allen & Jody Washatko</b></font></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" color="#0000ff" style="font: 12.0px Helvetica; color: #0000ff"><i>1971 TR6<span class="Apple-converted-space"> </span>- Number 6</i></font></p> </div> </div><br></div></body></html>