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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:14.0pt'>For the past 20 years or so I have had a NOS Circle B 6 cylinder head on a shelf in the parts room. For some reason I assumed it was for a TR-6 and would be ideal as a starting point for an eventual TR-250 project. Must to my disappointment I find it is a Mk2 GT-6 head. Likely it would afford too high a CR sitting on a 2500cc engine in stock condition. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>The question is……… Is it unreasonable to think I can open up the combustion chamber to bring the CR down to ~ 10.5:1 using it on a 2500cc application ?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Any of you have the combustion chamber volume to achieve this using flat top pistons ??<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Anyone out there have done this before? No point in trying to reinvent the wheel. Serial number on head is 517528.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Snow on the ground this AM and temps in the 20s has me already in the winter project mode!<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Russ Moore<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'>Spitfire #49<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt'><o:p> </o:p></span></p></div></body></html>