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Old 08-13-2013, 12:51 PM
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Performance Machine Mfg vs OEM Head Gaskets

There's only $83.00 difference between the two gaskets, so which one is the best quality?

I currently have ARP's with VR black onyx hg's that are bad. From what I've read these VR are junk. When I put them in back in 2010 everyone said they were great. Only have 20K on them and their bad.
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Old 08-13-2013, 01:20 PM
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I think it was site member Tuscany that did a whole write up on what he found wrong with the BO gaskets. He tore them down layer by layer looking for differences and it was somewhere in the middle where the BO gasket was thinner than the OEM gasket. Thinner means weaker to me. Were your heads machined properly and the block conditioned properly?
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Old 08-13-2013, 01:22 PM
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That was Dennis @ strictly diesel IIRC

While some said BO's were fine most have always agreed OEM
We now have Black Diamond also but no long term results with any other than OEM
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Old 08-13-2013, 01:23 PM
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Thanks, I'll look up his review.

At the time I was under the impression I could not deck the heads wo/ raising the valves. So at the time we checked them and reinstalled the heads.

This time they will be decked as long as it does not require more than .008 taken off.
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Old 08-13-2013, 01:27 PM
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I'd go oem. They have been proven over and over again.
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Old 08-13-2013, 01:28 PM
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Quote:
Victor-Reinz/Black-Onyx Headgaskets, Why IMHO they fail
After having experience with both selling these gaskets and in having to reinstall OE head-gaskets on vehicles that have had the "Black Onyx" gaskets installed, I decided to try and find out why the Victor-Reinz/Black Onyx gaskets fail and why the OE gaskets seem to last.

What I found was surprising.

Both brands of head-gasket consists of 5 layers of stainless(?) steel.

Both brands of head-gasket have a thinner layer (#4 up) with a folded ring that most likely acts as a fire ring*.

(*go here:ATS Diesel Fire Ring Head - 1039203278 | OC DIESEL for a picture of a fire ringed head)

Both brands of head-gasket have multiple (3) layers with a sealing(?) compound applied to both sides of the layer.

The OE gaskets use a blue sealing compound, the Victor Reinz use a black compound. Two of the three Victor Reinz layers with the sealing(?) compound on them are completely covered. None of the OE gasket layers are completely covered.

The measurements below pretty much spell out why the gaskets most likely fail in my humble opinion(IMHO). They were measured top (#1 up) to bottom (#5 up) as they would be installed on the engine. The OE gaskets were all measured on bare metal. The Victor Reinz were measured on bare metal where possible. The most notable difference was between the 3rd and 4th layers. Each brand of gasket has a built in "fire ring" on the 4th layer. This is where the layer is folded back on itself creating a "fire ring" around each cylinder opening. I believe it is the difference in thickness of the built in "fire ring" that could cause the Victor-Reinz/Black-Onyx head gaskets to fail more often. Also, the overall thickness of each layer could play a role as well.


Ford OE:

#1 up) .010" Bare metal

#2 up) .015"

#3 up) .010"

#4 up) .007" The "fire ring" fold is .014"

#5 up) .010" Bare metal


Victor-Reinz/Black-Onyx:

#1 up) .010" Including black coating

#2 up) .015"

#3 up) .007"

#4 up) .005" The "fire ring" fold is .010"

#5 up) .010" Including black coating
,,,,,,,,,,,,,,,,,,,,
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Old 08-13-2013, 01:30 PM
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Thanks for posting that info.

So I'm leaning toward the OEMs. How about the RCD Platinums? Suppose to be the same as the OEMs?
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Old 08-13-2013, 01:56 PM
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You should also check out this great thread to see what goes in to properly machining the heads... Not just a check and reinstall How to Machine the 6.0
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Old 08-13-2013, 02:09 PM
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Quote:
Originally Posted by michaelaiman View Post
You should also check out this great thread to see what goes in to properly machining the heads... Not just a check and reinstall How to Machine the 6.0
Thanks, I've seen that thread before.

The machine shop the heads are going to will be checking the valves.
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