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Milling heads for compression

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Old 11-25-2015, 06:24 PM
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Default Milling heads for compression

How much will have to be milled off a dart 308 head to reduce the volume by 5 or 6cc's? Is there a chart?

Unshrouding the valves and clean up will add a couple cc's to so may be up to 8 or so.
Thanks.
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Old 11-25-2015, 06:36 PM
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I would cc them then refill with the volume I was looking for and measure the gap between the water and the head surface. Not exact but will get you a good idea. Just a thought.
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Old 11-25-2015, 06:43 PM
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Originally Posted by GLENAMY 242SS
I would cc them then refill with the volume I was looking for and measure the gap between the water and the head surface. Not exact but will get you a good idea. Just a thought.
that will work just need a depth mic and level the head and check the depth in a couple of spots
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Old 11-25-2015, 06:49 PM
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Ok, liquid tends to "grab" at the edge and anything you stick near it, but that will work for an initial stab at it. Will make a final cut when it's close.
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Old 11-25-2015, 06:57 PM
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creating the meniscus
always measure from the bottom, low spot
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Old 11-25-2015, 07:47 PM
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.006 per cc for flat mill
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Old 11-25-2015, 08:02 PM
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Originally Posted by billy boats
.006 per cc for flat mill
So .035ish then? Good ballpark.
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Old 11-25-2015, 10:58 PM
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Originally Posted by GLENAMY 242SS
creating the meniscus
always measure from the bottom, low spot
Use a surfactant, soap?
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Old 11-26-2015, 02:01 AM
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If you take off more than .030, you will most likely need to have the intake milled to fit also.
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Old 11-26-2015, 07:48 AM
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^^And might need thicker intake gaskets^^
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