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gasket surfaces on heads

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Old Jul 21, 2008 | 01:08 PM
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Default gasket surfaces on heads

someone thought they should bead blast the heads and did even the intake and exhaust and valve cover gasket surfaces!!! My ? is should i be worried about it and get them cleaned up with a slight milling???? or what should i do
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Old Jul 21, 2008 | 01:15 PM
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If they were in a small blast cabinet, like you would use in a small home garage, then it's probably not going to hurt the surface. If it was done by some sort of large commercial blaster, then a resurface might be a good idea. I have a small blast cabinet in my shop and even with fine sand, it wouldn't hurt a set of heads.
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Old Jul 21, 2008 | 01:33 PM
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to the touch they are very smooth!! We have a realitively small cabinet, but i have never put heads in it. i dont think they are hurt but just wondering. Its like a fast blowoff to kinda clean the dirt off from the looks of it.
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Old Jul 21, 2008 | 01:41 PM
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if your putting on heads i believe its wise to have them resurfaced so they'll seat good.
i personally didn't do that with my used heads i put on, but if i were to do it again, its just added insurance!
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Old Jul 21, 2008 | 01:48 PM
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well the bottom is good but im having .015 milled off anyways!!!! i was just wondering mainly about the exhaust gasket surface since im using the gm stock metal gaskets
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Old Jul 21, 2008 | 01:53 PM
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just scrape that crap off if theres gasket stuck on??
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Old Jul 21, 2008 | 02:05 PM
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thats what im saying they already cleaned it up by blasting it with it looks like fine sand or glass beads
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Old Jul 21, 2008 | 02:24 PM
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Do you have access to a Profile-meter and a machinist straight edge? That will tell you quick.
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Old Jul 21, 2008 | 03:13 PM
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i have a straight edge in my box at work, but ill have to ask about the meter
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Old Jul 21, 2008 | 04:16 PM
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If not, then there are also roughness gages that you can compare the surface too to determine what the finish is. I would think you are OK on intake (soft gasket) and exhaust. I would be more concerned with the head gasket but it sounds like you have the covered with the milling, just make sure whoever mills the heads can meet the surface roughness requirements.
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Old Jul 22, 2008 | 07:59 AM
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Default beadf blast

Originally Posted by regency
thats what im saying they already cleaned it up by blasting it with it looks like fine sand or glass beads
I wouldnt bead blast any interal engine parts, that stuff is so hard to get completley cleaned out. pressure wash them for sure-several times. that bead is like super fine sand which is great friction reducer NOT
clean them up good
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Old Jul 22, 2008 | 09:27 AM
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lol i know what you mean.....
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