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What is a cylinder head spacer?

Old 03-09-2011, 05:59 PM
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Default What is a cylinder head spacer?

This one:

2000 MAZDA MIATA 1.8L 1839cc L4 FI DOHC : Engine : Cylinder Head Spacer Shim Wiki Price $10.84
VICTOR REINZ Part # 5878S

Will this work as a (misguided) means of reducing compression ratio?
(Yes I've heard about the problems with reducing squish, I'm just wondering if this is the "spacer" people talk about)

http://www.rockauto.com/catalog/rafr...arcode=1363744
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Old 03-09-2011, 06:05 PM
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If I remember correctly they use these when replacing a head gasket after resurfacing the head to keep the compression ratio the same, It will lower compression, but not much its just like using a thick head gasket.
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Old 03-09-2011, 06:08 PM
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I think that is just a messed up name for a head gasket...
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Old 03-09-2011, 06:23 PM
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No head gasket in the world costs $10
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Old 03-09-2011, 06:26 PM
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Yes it is to maintain CR if the head is shaved. However, they can be run without a head gasket to increase CR or run with one to decrease. I forget how much it changed the compression on my 440. (It's common practice to run a shim alone with no HG).

Do us a favor and contact the vendor about application and CR changes. I would be concerned about running more material between the head and block with high boost. Seems like it could be a weak point.


^^^^Agreed, if it is $10 it is not the shim that I am thinking about.

Mopar steel shims for 440 $160
http://www.summitracing.com/parts/DCC-5155237
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Old 03-09-2011, 06:28 PM
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Originally Posted by falcon View Post
No head gasket in the world costs $10
Except that calling it a spacer or shim is common. It's closeout priced, like yer Mom.

https://www.miataturbo.net/attachmen...1&d=1299713317
Attached Thumbnails What is a cylinder head spacer?-screen-shot-2011-03-09-6.27.28-pm.png  
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Old 03-09-2011, 06:37 PM
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I see there is a 5878 and a 5878S...
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Old 03-09-2011, 08:08 PM
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Part Type: Cylinder Head Spacer Shim



* Manufacturer: VICTOR REINZ
* Part No: 5878S
* Notes: Requires Sealing Compound

Closeout Price: $10.84
Only 1 Remaining!

It's a Nitroseal gasket made by Clevite/Mahle I believe.

good thread: http://forum.miata.net/vb/archive/in.../t-328263.html

Last edited by miatauser884; 03-09-2011 at 08:19 PM.
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