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  #1   IP: 128.183.140.38
Old 04-08-2010, 03:22 PM
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edwardc edwardc is offline
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OEM Head vs Aftermarket Head

What started out as a simple thermostat gasket replacement to fix a slow weeping leak ended up uncovering both a cracked thermostat housing AND a cracked head. This appears to have been due to improper winterizing in 2008 by the previous owner.

After replacing the housing, and a failed attempt to seal the head crack with JB Weld (just kept finding more crack), I'm resigned to the need to replace the head.

But within a few hours of each other, I've gotten diametrically opposed recommendations from trusted, well-recommended A4 mechanics in my area (Baltimore - Annapolis). One said "Be sure to install the Moyer Marine aftermarket head, as it has improvements". The other said "We only use Universal heads, and will not even install a customer-purchased Moyer Marine head."

So, my question is, what are the significant differences between the OEM Universal head and the MM aftermarket head? (besides cost)

From a look at the MM online store, the OEM head weighs 13.2 lbs, while the MM Head weighs 16 lbs. That's over 20% more. To me, this suggests that the MM Head has thicker walls, and would be more resistant to corrosion.

So, whats the story here? Are there real trade-offs, or is the one mechanic just shining me on?

@(^.^)@ Ed
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  #2   IP: 128.183.140.38
Old 04-08-2010, 03:51 PM
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First photo shows the cracks in the housing at both ears and the control boss.

The second one shows water beading up on the head after replacing the housing.

The third one shows (not too well) an overhead view of the crack after exposing it. After trying to seal it, I found that it extends over the edge and down the side most of the way to the block.

@(^.^)@ Ed
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  #3   IP: 166.137.8.45
Old 04-08-2010, 04:34 PM
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My guess would be that it has something to do with the profit the DON'T make using a head that you buy and bring to them to install

just my 2 cents
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