Yes Andrew, neat photo! Hope those hemi’s run in a different class than your fh, probably create a little friction losing to a L-head, although be fun with your family : ) Had to read up on 8620 alloy and DLC, always a good day when I learn something new, found 8620 is between .50-.55 carbon and 4130 is .70 and they can be used interchangeably on some parts. Your engine got me curious, I agree on less weight, plus helps your valve springs. The ti valves $$$ compared to ss (cost-benefit analysis). I’ve seen mushroom style lifters before, never like those and never in a fh. I’m guessing your plans are to run 8620 cam less bearings to increase lobe/lift, you might achieve over 0.500 (pretty rare for V8 ford fh) maybe prompting your decision for mushroom lifters. You been studying your engine build for awhile… I think what you doing very cool! Taking your time, smart move. DF
8620 Alloy (from ehow.com) When the 8620 alloy is properly carburized --- heated to a set temperature and then exposed to an agent containing carbon, a process which adds an extra layer of carbon to the outside of the steel, thereby making it stronger --- it is used to make such machine parts as gears, crankshafts, and gear rings. Carburized 8620 alloy is strong and durable, which is why it is preferred for these parts.
Properties of Diamond-Like Coatings (from azom.com the a to z of materials)
Amorphous (a-C) and hydrogenated amorphous carbon (a-C:H) films have high hardness, low friction, electrical insulation, chemical inertness, optical transparency, biological compatibility, ability to absorb photons selectively, smoothness, and resistance to wear. For a number of years, these economically and technologically attractive properties have drawn almost unparalleled interest towards these coatings. Carbon films with very high hardness, high resistivity, and dielectric optical properties, are now described as diamond-like carbon or DLC.
