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Generation III Internal Engine 1997-2006 LS1 | LS6
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Take a look at this Intake Port PIC

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Old 03-29-2008, 04:32 PM
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Default Take a look at this Intake Port PIC
853 castings with 2.02 1.575. CNC'd
Is there supposed to be that much valve guide exposed?

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Old 03-29-2008, 05:37 PM
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I've got the 5.3 casting as well and it doesn't have quite that much exposed but it's got about a quarter of an inch exposed at the bottom. I would say it's ok. It doesn't look like a piece broke off or anything.
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Old 03-29-2008, 05:51 PM
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Nothing is broke, it just has gobbs of runner peeled away.
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Old 03-29-2008, 07:17 PM
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Looks like new guides that are longer than stock. If those are the same as stock, it doesn't look good and I wouldn't take that much material off when porting.
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Old 03-29-2008, 07:19 PM
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Do you know what the CC for that port is?
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Old 03-29-2008, 08:32 PM
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I dont know what the CC of the runner is. Not that this means much, but I can see the rocker stud tips from inside the runner. It is supported at the other side of the guide. They look to be the same lenght as the stock guides. My 241's only have the beveled end of the guid exposed.
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Old 03-29-2008, 09:38 PM
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It looks like the guides were installed after the heads were ported.
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Old 03-30-2008, 07:58 AM
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I would be worried that the guide would rock in teh casting and cause oil leaks.
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Old 03-30-2008, 10:25 AM
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Originally Posted by aerotest
I would be worried that the guide would rock in teh casting and cause oil leaks.
Thats what I was thinking... not enough material around it to prevent it from moving, esp. at high rpm.
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Old 03-30-2008, 01:53 PM
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Originally Posted by ss1
It looks like the guides were installed after the heads were ported.
I think you're probably right, or they have been replaced.
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Old 03-30-2008, 02:45 PM
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I agree, got to be new guides. I was hoping someone would reply with something like "Ah, that looks fine." No wise cracks.
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Old 03-30-2008, 05:16 PM
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ive never seen anything like that before
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Old 03-30-2008, 07:39 PM
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the guides were installed after the cnc was done. There is nothing wrong with that as long as the guides were installed with the proper press fit
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Old 03-30-2008, 08:18 PM
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seems a bit odd but it should be fine
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Old 04-01-2008, 09:40 AM
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Still trying to reach someone that has actually seen a headed ported to this extent.
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Old 04-01-2008, 10:33 AM
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I'm gonna ask, where did these heads come from?
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Old 04-01-2008, 10:44 AM
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A customer of mine had them done. He is since doing a stroker and running a set of ET heads. I do not know what shop did the CNC work.
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Old 04-01-2008, 11:13 AM
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Correct me if Im wrong, but I think the stock valves were grey iron or steel. Bronze guides must be aftermarket.
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Old 04-01-2008, 12:00 PM
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It has aftermarket guides and vavles. I am just concerned about the amount of guide hanging in the port. Strenth of the guide is my concern.
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Old 04-01-2008, 07:17 PM
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Originally Posted by UGotBeaT
the guides were installed after the cnc was done. There is nothing wrong with that as long as the guides were installed with the proper press fit
It will work...
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