Re: KR Heads
Posted: Tue May 02, 2017 1:11 pm
starcain wrote:If the Competition Racer manual is circa 1959, and since it shows the final #7 head shelf schematic for a flat top piston (FTP) KR, it would follow that all the head development, relating to FTP KRs that the factory divulged, occurred between 1952 and 1959? Presumably the 60-R head incorporated all the learnings occurring up to that point in time and all 60-R heads are #7? And sometime from 1960 to 1969 the clearance specs you quoted were discovered?
wz507, For what it's worth, I have a set of 60-R heads that are # 6
Thanks again for that, as that's exactly why I asked! Your 60-R head #6 then leaves open the possibility that the #7 might have the higher valve to head clearance that Patrick recited, or perhaps it was even post head #7 development, i.e., the latest latest of the last Mohican. Do you have any idea what the valve to head clearance might be for your #6 head? If not, how deep are the head reliefs at the valve circumference near points A and B in your #6 combustion chamber? Thank you.