I find myself low on presentable heads. Consider this page for reference only until I can have: 1) bad "gasket" surfaces milled smooth, 2) broken fins built up and shaped.
920 heads with five angle (75, 60, 46, 31, and 15 degrees) valve jobs with new stock size stainless steel valves with Stellite tips and faces, Viton valve guide seals, and finewire chrome and silicon springs, titanium retainers, good to valve lifts up to .600".Ports lightly massaged (there is very little that can be done) for better flow.
Titanium jumped a LOT in price recently.
The above assembled with a set of HARD rockers and flow-modified fittings and high quality drive-side bearings. Ports opened on the intake to accomodate large flanges (stock and Mikuni), and raised and polished on the exhaust.
Use "contact" button ts discuss this option.
This last option shall be available with eleven hundred heads. This is recommended for any engine with a stroke of 75mm or more. I prefer these heads as the valve shrouding of the smaller engines is absent - resulting in better flow inside the cylinders.
We are currently working with Kibblewhite on C630 (a long wearing, low friction aluminum/bronze/molybdenum alloy) guides and 2mm over-size intake and exhaust valves. Possibly smaller OD retainers and less expensive springs to make working on them easier. _Maybe_ titanium keepers and jam nuts, and longer wearing adjusters.
There would be two versions of these heads: one with springs good to .515" lift - adequate for the -C01 cams; and another with our current springs (good to .600" valve lift) for those who want to run monster lifts like that of our -C06 cams.