799 head problems ??
06-04-2013, 08:37 PM
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799 head problems ??
I have a 2006 sierra ext cab 4x4 with an L33 engine. I have 185,000 miles on it now. I bought the truck new and have had few problems. I did notice it using oil since it was still under warranty. I have read the postings on here about the castech heads and this sounds exactly like the problem I am having. My truck has 799 heads and I am wondering if these are known to have the problems also? I have not had time to pull the valve covers to see if they are castech heads or not. Did castech make the 799 heads?
Also- I have a very overactive PCV system. I have to drain 8 oz. of oil out of a catch can from my drivers side PCV line every Sunday. What can be done to fix this correctly?
Also- I have a very overactive PCV system. I have to drain 8 oz. of oil out of a catch can from my drivers side PCV line every Sunday. What can be done to fix this correctly?
06-05-2013, 03:09 PM
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I have a 2006 sierra ext cab 4x4 with an L33 engine. I have 185,000 miles on it now. I bought the truck new and have had few problems. I did notice it using oil since it was still under warranty. I have read the postings on here about the castech heads and this sounds exactly like the problem I am having. My truck has 799 heads and I am wondering if these are known to have the problems also? I have not had time to pull the valve covers to see if they are castech heads or not. Did castech make the 799 heads?
Also- I have a very overactive PCV system. I have to drain 8 oz. of oil out of a catch can from my drivers side PCV line every Sunday. What can be done to fix this correctly?
Also- I have a very overactive PCV system. I have to drain 8 oz. of oil out of a catch can from my drivers side PCV line every Sunday. What can be done to fix this correctly?
Here's my fix.
2007 Sierra Classic 5.3L (L33) Blue Smoke on Start-up
06-05-2013, 04:59 PM
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I should have given more info. I suspect the baffle is the problem with the oil consumption. I am wondering if a new set of valve covers will fix this or will I have the same problem again? I can only imagine what a set of GM valve covers cost $$$$$
I oil I am draining from my catch can looks like creamy coffee. Very light tan in color. Looks to me like oil/coolant. This is why I thought of the cracked haed problem. Could just be a head gasket but I was trying to do some homework before I pulled it all apart. If the 799 heads could be the problem; then I was going to buy a replacement set to put on quickly while I have the truck tore apart. This is my daily driver.
I oil I am draining from my catch can looks like creamy coffee. Very light tan in color. Looks to me like oil/coolant. This is why I thought of the cracked haed problem. Could just be a head gasket but I was trying to do some homework before I pulled it all apart. If the 799 heads could be the problem; then I was going to buy a replacement set to put on quickly while I have the truck tore apart. This is my daily driver.
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06-05-2013, 08:54 PM
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Ah, I see. Castech did some 243's, so I would bank they did some 799's too, given they are identical.
That said, as mentioned before, the 243 and 799 seemed to be fine.
It's not that hard to pull a valve cover to check for the castech logo, but not all castech heads are duds that with cracking issues.
That said, as mentioned before, the 243 and 799 seemed to be fine.
It's not that hard to pull a valve cover to check for the castech logo, but not all castech heads are duds that with cracking issues.
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