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Old 04-12-2013, 03:13 PM   #11
iminhell
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No problem.

FWIW, I pay about $10 per thousandth to have mine cut down.
But I have them preped prior to my machinist getting them.
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Old 04-12-2013, 03:16 PM   #12
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Prepped? What do you do to get it prepped?

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Old 04-12-2013, 04:11 PM   #13
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Wet dry sandpaper on a flat surface and do it by hand............

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Old 04-12-2013, 05:04 PM   #14
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I take that to mean for prep- so they can get a better indicator reading on it when setting it up? Or after machining it?


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Old 04-12-2013, 11:47 PM   #15
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Quote:
Originally Posted by emsvitil View Post
Wet dry sandpaper on a flat surface and do it by hand............


Um, no.


I mean that my heads are bare, no caps, dowels, springs, valves, etc. Completely bare.
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Old 04-13-2013, 12:37 AM   #16
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I do have the cams and followers out. But does it have to be completely bare? Still have the valves, springs, timing belt tensioner and idler on it
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Old 04-13-2013, 02:22 AM   #17
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Yes.

You don't want metal chips hiding anywhere.
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Old 04-13-2013, 02:31 AM   #18
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Ok. .
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Old 04-13-2013, 05:13 AM   #19
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X2, also, never leave any parts on that can mysterious disappear when the machinist decides he doesn't want this or that part on, it's in the way of his work. They need the upper flat on top of head totally unencumbered to use as the register point to fasten the head down. Valves have to be out depending on depth of cut and head design.
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Old 04-23-2013, 04:51 AM   #20
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Well, I've found a shop near me that can shave .020 off my zetec head. Using the formula from the compression ratio thread, I came up with 10.15CR up from the stock 9.6. I'd be happy enough with that- I want to be able to save a little $ still run 89 octane if I want.

And the guy at the shop said I don't have to take the valves out. As long as the cams are out and valves are closed, it wouldn't be a problem. He will mill it, then use a diamond wheel to put on a finish better than 30Ra. I still did something goofy when prepping though: I put a layer of white lithium grease in the crevices around the valves just in case. Also put tape over the ports and installed an old set of spark plugs to keep chips out of there too.

All for $75. I'll keep you guys posted and hopefully have some pics of before & after.
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