Solid roller lifters, cylinder heads and more

[blykins]

There are such things as "tight lash" camshafts...

However, on the general, you NEED that much lash. The lobes are designed for it as it makes a nice gentle (if you can call any of this gentle, but it's a relative term) take-off and let-down of the valve. Otherwise it would be a very violent collision. Again, it all depends on the lobe design....some of the Comp street roller cams like around .016". Some of the other lobes like .020-.022". It just depends. It is necessary though to keep from being hard on, and breaking parts.

[RET_COP]

Think about how much clearance .010 actually is.With all the different metals involved that someone could mix and match, Heads, Block, different valve stems, different gas temperatures It has to be there for some insurance that the valve will close. There selling cams for alot of different engine combination's.
Ask the question, Why is there No valve lash with hydraulics?
The above problems don't apply.
After knowing how the metals in your personal engine move at operating temps, you could then set your own lash tighter (more causes problems)than recommendations. It changes the cam profile, but if you could grind you own cams profiles to your engine you could keep tighter lashes and have the same profile as the off the shelf one that worked.
Lou

[Ant]

Titanium valves, I opted to go stainless valves with the Yates heads for several reasons my engine is 373 and doesnt need to go over 7000rpm, another was that Titanium valves have less of a life cycle than stainless valves due to the coating wearing?