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Old 09-11-2010, 09:17 AM   #1
Pavoni8297
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08 Legacy Spec B
DGM

Default Build Progess and Issues ( Head Aches LOL)

Hey I am building my engine and the shortblock is done clearances are right on the money.

CP Pistons .020 over
New EJ205 crank
STI Rods....

Heads...
Needed to replace one cam due to scoring to cam lobes or journals
The CP's have a shallower valve relief area and there isn't enough clearance even with the smallest buckets..so it seems the heads need to go back to the machine shop to remove some material from the valve stems....

Is this common? WTF
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Old 09-11-2010, 07:21 PM   #2
soobaviator
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Is this a stock head?

Don't worry about the valve reliefs, worry about setting the proper lash. What size test bucket are you using?
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Old 09-11-2010, 09:35 PM   #3
Pavoni8297
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the head was one I bought from someone on here....ported and polished with bc valves oem size, springs etc.the mechanics said not enough clearance between the valve shim buckets and the cams. Every single one is too tight, even when using the smallest bucket we have

Last edited by Pavoni8297; 09-11-2010 at 09:42 PM.
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Old 09-11-2010, 10:09 PM   #4
soobaviator
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I got the part that the clearance is too tight, however I would like know what bucket size the builder is using as a test bucket. Better yet what are the test clearances. There is only so much you can machine off the valve tips without removing the hardness layer.
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Old 09-12-2010, 02:16 AM   #5
paintbing
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How much can be tipped from the valve? I just got my heads back too and they are across the board - from 510 all the way to 460... I have 52 buckets ranging from 508 to 480... I'm thinking I might switch valves around (can this be done on a fresh head with fresh angled job?) Not meaning the threadjack...
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Old 09-12-2010, 08:19 AM   #6
soobaviator
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The tip grinding should be less than .010. (.25 mm) it's cheaper than switching buckets but has to be done correctly keeping the tip square and true.
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Old 09-12-2010, 08:59 AM   #7
Pavoni8297
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so once I find the bucket size they were using could this grinding be the fix? what is the smallest bucket size???
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Old 09-12-2010, 09:05 AM   #8
soobaviator
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The thinnest bucket is a 438
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Old 09-12-2010, 10:37 PM   #9
Pavoni8297
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will talk to them tomorrow...getting close....
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Old 09-13-2010, 08:35 AM   #10
Pavoni8297
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They used a 438 and there were still issues...what now?
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Old 09-13-2010, 10:25 AM   #11
soobaviator
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Time to start grinding tips...
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Old 09-13-2010, 10:21 PM   #12
Pavoni8297
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so is it no big deal to do this?
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Old 09-14-2010, 01:50 AM   #13
paintbing
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Well, if you need to grind more than .25mm off the tips then you'll be through the hardened layer - Not sure what this would do, but I'm sure it's not good.
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Old 09-14-2010, 11:00 AM   #14
bertune
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Quote:
Originally Posted by Pavoni8297 View Post
They used a 438 and there were still issues...what now?
Is there any clearance at all, if no feeler gauge can go between the cam and bucket there is a possibility that shaving .010" off the valve won't be enough.
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Old 09-14-2010, 12:38 PM   #15
soobaviator
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For tip grinding you need to have it done by someone with the proper tools and know-how. If you have to grind more than .005 a new beveled edge should be ground on the tip as well. It's not really a big deal and my local machinist does it for a few bucks a valve.

For future reference it's usually better to get valves that are slightly shorter than OEM when building heads. Makes setting the lash a lot easier after seats have been ground and/or new cams installed.
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