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RMS values are outdated measures.
RA is the modern method of surface analyzing, and has been designated by the International Standards Organizations ISO as the correct practice for measuring the roughness of a machined surface. Multiplying RA value times 1. A great link explaining all of this much better than I can: Although they are different companies, they share inventory and work it out somehow.
They will make valves to your specs if you provide a print. They are made in Argentina.
I've used SI valves quite a bit over the years and I think their stuff is just fine. They seem to Gathered info a catalog that's sort of confusing but if you call them they will point you in the right direction.
I've used their PortFlow and Silverline valves with fine results in all sorts of racing and street applications. SI valve stuff is fine, but you have to remember that they have several levels of quality depending upon the intended application.
The Portflow valves for instance are an inexpensive swirl polished stainless valve that's intended for mild applications, something with a solid flat tappet cam etc.
I've used them in circle track engines with fine results but on two barrel stuff I've used their premium valves in the exhaust side. Their SilverLine valves are very nice quality and they are suitable for racing roller applications.
When you talk to them be sure to ask a few questions, tell them about your application and they will sell you the right stuff. Their valve seats are good too.
Titanium Valves Is there any problem with backcutting a titanium intake valve? Backcutting titanium valves is dependent on the manufacter. Ferrea valves are usually a non-issue where as some Manley valves have such a thin head thickness, that you can hardly get a backcut.
You have to check to see if there is enough margin thickness, like around. How about titanium valves on a street engine? Titanium does NOT provide a good "wear" surface. That is the reason the stems are moly coated and it is also the reason the stem tip requires protection.
You need either hardened stellite tips installed or lash caps, for race engine use. Then if you are going to use the titanium valves on the street, in addition to the above, you will need a very expensive DLC coating, or TiAlN coating on the seat contact surface.
Head Bolt Data This is the measured the height of the various castings at the outside roll of bolt holes, in other words, where the machined surface or flat is for the head bolt washers.Gathered: Contemporary Quaker Poets, the first anthology of its kind, seeks to give the best Quaker poets writing today a voice in contemporary letters.
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