Datsun Roadster Forum-311s.org

Top quality Custom Stainless valves for U20. Swirl polished, ALL USA quality, These make an extremely durable valve setup.

21-4N alloy, Hardened tips, Slight oversize "seat savers"

4 intakes 100, (1.840")
4 exhaust 135, (1.45")
or 200 for full set.

Custom Silicon Bronze 2L Guides 85/set

Spring Set 100/set

Camstand shims 55/set

Racer Brown camshaft. 245 exchange

Email for additional info about small stem lightweight U20 Valve Kits!/ thx! JT
Expert machining and complete heads available.

This is beyond cinemax softcore. We are talking full on hard core Datsun Roadster XXX porn. Makes me want to run a U20.

Why is stainless best ?
Easier on the engine if they hit I'd guess

redroadster wrote:Why is stainless best ?
Easier on the engine if they hit I'd guess

Yes, they might bend easier if they meet a piston (rather than knocking a hole in it), but its really just excellent metallurgy for today's gas, valve seats, and either original or the bronze guides. Inconel and titanium are better for some extreme/turbo uses, but way more money, these are great for any non-turbo engine.

tjp wrote:This is beyond cinemax softcore. We are talking full on hard core Datsun Roadster XXX porn. Makes me want to run a U20.

LOL, here are the sexy ones for the pushrod engines:

http://www.311s.org/phpBB3/viewtopic.php?f=61&t=27624

(caution hardcore)

added shims

Definitely a worry about the exhaust side for long term/hard use IMO
has chromium content ?

Top shelf, high chromium,21-4N. Excellent alloy for SS high performance exhaust valves. (Used in thousands of modern engines and racing applications.). Should go a very long time.

If you want Ti, can build those too-may require a 2nd mortgage lol. These are quite nice for the cost! J

Are they 7mm stems?

PM'd. These are std replacement versions, stock stem, and slight oversize heads to save your seats.

I did not think you could add much to Stainless ( iron and nickel)
try cutting through a stainless bolt and a low carbon bolt , after you get through the oxide , which is a bit tough it cuts easily , much softer than the steel

Added Racer Brown cam.

IIRC, they should be surface hardened on tip if going for long term usage.

Manley Custom Valves

Naturally these have hardened tips as well. ( must be ground, can't be machined ).

It's actually much less of an issue on the U 20 since the last pad is the hardened wearing surface. The lash pad serves as a wear cap and the wear usually occurs on the underside of the lash pad, not the valve.

I maintain a very high standard with my reproductions. No cheapy,budget stuff allowed. If I would use them in my engines, it's excellent, end of story! Peace Jt

Stainless steel alloys have been the go to material for valves for many, many, years...
From Engine builder mag. website:
"The most popular materials for exhaust valves, however, are austenitic stainless steel alloys such as 21-2N and 21-4N."
http://www.enginebuildermag.com/2005/12 ... t-engines/

There are many different stainless steel alloys, for many different uses, I've seen one so soft just gripping it with a pair of pliers would mark it with the lines of the plier jaws....