fendersceptre

Who is running the hollow stemmed valves from Ferrea? If so how's your experience been with them?

Thanks!
Joshua

Edit: If you are, please leave info about your setup:
Guides
Cam
Springs
Red line limit?
Valves
Other mods

Thanks!

spra4u

vertC6

Does anyone have the part number?

vertC6

I will be installing it later this year

fendersceptre

F2042P. Thats the one I've been looking at.
-Joshua

'06 Quicksilver Z06

Evil427 runs it. As does NavyAirTraffic.

A few others on the Registry listing run it as well.

You might try contacting them.

The people at American Heritage may be able to give you some more information on it as well, they offer it in one of their head packages.

American Heritage

We stock boxes of them. Use them in almost every LS7 head we do. 84-86 grams (cant remember which it is off the top of my head). The F2042P is very good alternative to the stock LS7 exh. valve and is significantly lighter than most SS valves (96-110grams depending on manufacture of solid SS valve).

fendersceptre

Thanks for the info!
Can you confirm that they are one piece?

Also what springs are you running with them? I was thinking Katech torquer cam with the PSI Springs that came with the cam.

Thanks!
Joshua

meanjoe

F2042P
A set can be had for around $275.00 shipped

Sorry, didn't see that post just above mine.

jconnors316

Just picked my heads up an hour ago. Put ferrera hollow stems in them, install tomorrow.

double06

I have had them in the car about 6-7 months. About 85 grams.

Mark2009

I believe they are, but the whole two-piece/welded deal is just a fear factor technique (the OEM valves are actually two different alloys, the main reason for their two piece design... it's a high tech feature designed to deal with the heat and the demands of the engine, not a detriment).

I think that most experts would agree with your thinking. If I were starting from scratch that is what I would run (spring-wise). There is, however, an old-school contingent that can't let go of those old dual springs (I suppose they also run carburetors and distributor ignitions ).

.

NavyAirTraffic

Like Quick stated, I run them. Best thing to do is contact Kohle at American Heritage, very knowledgable and generous with his time.

However the real reason I chose the F2042P's is because of what Richard (WCCH) said about the sodium valves on a different forum. Good luck!

fendersceptre

Hi Navy,
Thanks for the info! Are you limiting your red line at all? Also what springs and cam are you running?
Thanks!
Joshua

sublime1996525

ramairws6

QUOTE:
We have definitely seen excessive wear in some LS7 exhaust guides. Mostly coming from engines with over 30k on the clock. We have seen some heads show inconsistent wear requiring only one or two guides needing replacement. It appears that the sodium exhaut valves are transmitting an excessive amount of heat from the stem to the guide. In some cases the oil is BBQ'd in the guide and the lack of lubrication and cooling from the oil causes the excessive wear (mostly in the lower half of the exhaut guide). We've measured some guides as having over .004" of wear in the lower 1" of exhaust guide length. Porsche 911's suffer the same type of related guide wear on the exhaust side.
The next item to note regarding the sodium exhaust valves relates to the wall thickness of the sodium exhaust valve stem. It's only .040" thick and makes for a fragile exhaust valve. GM uses a good quality steel material but the design spec. renders the valves brittle at the neck. Hence the reason we choose the replace the factory units with stainless or inconel. The exhaust valves we use are manufactured with a .001" oversized stem size which allows us to hone the exhaust guides and remove most or all of the taper in the bore. In cases with excessive wear we replace the guides with bronze.



Man, i don't know how much better some people on here need it explained to them!?

forg0tmypen

I'd like to see these valves on the spintron machine:
Torquer cam/psi beehive springs/ferrea hollow SS valves. My guess, they would show stability up to 7,100. But I'd like to see the test run

Blackonblacksls

Yeah that made a lot or sense till people started realizing that it valve guide issues aren't isolated to just exhuast sides.


I think now the consensus is it's a valve seat machining error and there aren't really any issues with the valves.

That being said, a two piece valve won't stay together after abuse or machining errors as well as a once piece..

Mark2009

To the contrary. Once the guides are worn out, the stems are unable to transfer the heat to the guide, which cooks the oil on the stem.

Since you clearly haven't gotten it yet, you tell us

By the way, folks, ramair's post was plagiarized, verbatim, from a four-year-old post by someone else on another forum: http://ls1tech.com/forums/13450863-post12.html .

Wass

I wouldn't have known because he's on my ignore list.