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Old 04-25-2014, 03:12 PM   #1
fendersceptre
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Default Who's running Ferrea hollow stemmed exhaust valves? F2042P

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!

Last edited by fendersceptre; 04-27-2014 at 11:27 AM. Reason: More Info
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Old 04-25-2014, 04:34 PM   #2
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Old 04-25-2014, 04:43 PM   #3
vertC6
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Does anyone have the part number?
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Old 04-25-2014, 04:44 PM   #4
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I will be installing it later this year
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Old 04-25-2014, 04:52 PM   #5
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F2042P. Thats the one I've been looking at.
-Joshua
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Old 04-25-2014, 05:00 PM   #6
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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.
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Old 04-25-2014, 05:32 PM   #7
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Quote:
Originally Posted by '06 Quicksilver Z06 View Post
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.
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).
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Old 04-25-2014, 05:34 PM   #8
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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
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Old 04-25-2014, 06:14 PM   #9
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Quote:
Originally Posted by vertC6 View Post
Does anyone have the part number?
F2042P
A set can be had for around $275.00 shipped

Sorry, didn't see that post just above mine.
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Old 04-25-2014, 06:50 PM   #10
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Just picked my heads up an hour ago. Put ferrera hollow stems in them, install tomorrow.
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Old 04-25-2014, 06:54 PM   #11
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Default I have them in mine

I have had them in the car about 6-7 months. About 85 grams.
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Old 04-25-2014, 07:17 PM   #12
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Quote:
Originally Posted by fendersceptre View Post
Thanks for the info! Can you confirm that they are one piece? [...]
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).

Quote:
Originally Posted by fendersceptre View Post
Also what springs are you running with them? I was thinking Katech torquer cam with the PSI Springs that came with the cam.
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 ).

.

Last edited by Mark2009; 04-25-2014 at 07:19 PM.
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Old 04-25-2014, 08:10 PM   #13
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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!

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.
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Old 04-25-2014, 09:42 PM   #14
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Hi Navy,
Thanks for the info! Are you limiting your red line at all? Also what springs and cam are you running?
Thanks!
Joshua
Quote:
Originally Posted by NavyAirTraffic View Post
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!
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Old 04-26-2014, 01:25 AM   #15
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Old 04-26-2014, 11:53 AM   #16
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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!?

Last edited by ramairws6; 04-27-2014 at 10:06 AM.
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Old 04-26-2014, 01:56 PM   #17
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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
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Old 04-26-2014, 02:01 PM   #18
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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..
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Old 04-26-2014, 07:11 PM   #19
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Quote:
Originally Posted by ramairws6 View Post
[...] It appears that the sodium exhaut valves are transmitting an excessive amount of heat from the stem to the guide. [...]
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.

Quote:
Originally Posted by ramairws6 View Post
Man, i don't know how much better some people on here need it explained to them!?
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 .
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Old 04-26-2014, 08:04 PM   #20
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I wouldn't have known because he's on my ignore list.
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Old 04-26-2014, 08:04 PM
 
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