The HRC valves were flat-faced, which is where the full 12.8:1 compressions ratio resulted when used with high-compression pistons.
The OEM dished-face valves is what lowers the compression ratio down to 11.8:1.
However, good luck finding the HRC valves. They've been unobtainium for a number of years.
Kibblewhite Performance has made a titanium valve set for a few racers in the past.
They are to be used with their valve seats which are compatible for titanium valves.
And their Ti valves are flat-faced, giving the full compression ration.
They also made the Ti spring retainers for use with HRC/Moriwaki springs and spring seats.
HRC springs are also pretty much history.
If an HRC valve spring set were obtained, it is possible they could be reverse engineered.
The Durbahn lightweight alternator was for race use only at higher revs.
It could not power normal electrical loads for street use.
The OEM altenator rotor can be removed and a few thousands (around .020") shaved off for quicker throttle response.
Pankl in Austria, owns Carrillo Rods and CP Pistons here in the US.
The Carrillo rods I already have in my engine, as well as CP pistons.
CP pistons also come with DLC coated wrist pins also.
Last edited by SubSailor; 08-01-2014 at 08:41 PM.