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    2003 Tahoe coolant system leak or head gasket leak?

    The tablets are definitely tempting for sure. I just can't believe they would stop a crack in the cylinder head. Just to be sure, are you certain you had that crack? Did you stop losing radiator fluid or is it just a slower loss?
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    2003 Tahoe coolant system leak or head gasket leak?

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    2003 Tahoe coolant system leak or head gasket leak?

    Good to know. Waiting on Blackstone at thr moment to confirm coolant in oil. With a job this big, I want to be absolutely sure. I likely will need your help again. Be in touch soon.
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    2003 Tahoe coolant system leak or head gasket leak?

    Woe the first time I looked I only saw the covers, but I just saw the top of the cylinder head. I am not worthy! I am not worthy!
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    2003 Tahoe coolant system leak or head gasket leak?

    I haven't yet but looking for a response from Blackstone. If coolant is in the water then they both come off whether or not these old eyes can see anything or not. I am realtively certain it is all coming off shortly. LOL. Question for you. Do the 799 heads require premium gas or can I...
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    2003 Tahoe coolant system leak or head gasket leak?

    NICE!
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    2003 Tahoe coolant system leak or head gasket leak?

    Also I was looking at your jelly pictures (LOL). It looks like driver's side had the most jelly even though passenger side had the crack in it. I think what happens is that the Jelly ends up blocking the PCV valve and hence the jelly is worse on the driver's side? Just a thought. Well if...
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    2003 Tahoe coolant system leak or head gasket leak?

    Got it. Sorry Matt I didn't realize it was you. Alright well...Hmmm... LOL I am going to wait for Blackstone. If there is coolant found, I am going to pull the trigger on new heads, valley pan gasket, new knock sensors (one knock sensor is either broke or rust has blocked the grounding to the...
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    2003 Tahoe coolant system leak or head gasket leak?

    Thanks, good to know. Did you have the jelly on your valve cover as well?
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    2003 Tahoe coolant system leak or head gasket leak?

    Again I don't see anything obvious. As mentioned, my engine is super clean as you can see in the pictures. Not bragging but very clean for 200k miles. I don't see anything that jumps out at me except the lumpy stuff which I wiped off prior to these pictures. Most were in the valve cover and in...
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    2003 Tahoe coolant system leak or head gasket leak?

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    2003 Tahoe coolant system leak or head gasket leak?

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    2003 Tahoe coolant system leak or head gasket leak?

    I don't see much here. One thing to note before I took this picture earlier today, there was bunch of gunk built up in between 3 and 5.
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    2003 Tahoe coolant system leak or head gasket leak?

    Do the 799 heads require a different head gasket or anything else different. I can get a pretty good deal on a set of these. Will send pics shortly.
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    2003 Tahoe coolant system leak or head gasket leak?

    This is very frustrating to say the least. Any input, insight, anything please. I will glean info. I just put 17 PSI on the pressure tank and it held forever. No loss in pressure. This is very confusing and I don't want to go through replacing the heads for no reason at all! Any input will...
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    2003 Tahoe coolant system leak or head gasket leak?

    Same gunk but a darker background. The only reason mine doesn't look like yours is my valve cover is nearly new. I just hope the engine is still in one piece after running partial coolant as oil. Good grief. Not going to bother with any further inspections. 203k miles and I have the 706...
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    2003 Tahoe coolant system leak or head gasket leak?

    OK Major Update! See Pics. I just replaced the valve cover 6 months ago and about 2300 miles ago and here is what it looks like. The gunk seems to have built up the cylinder head between the 5th and 3rd cylinder most ( dont have a picture of this )... Any conclusions?
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    2003 Tahoe coolant system leak or head gasket leak?

    What's odd is that I only have about 3 months on an oil change and about 900 miles and it is very dirty. I drained enough today after sitting for about 36 hours into a clear glass to see maybe if water flowed out first. This wasn't the case so this is good. But the oil was very dark...
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    2003 Tahoe coolant system leak or head gasket leak?

    Thanks. I have done some very extensive jobs on all my vehicles. So I am pretty well mechanically inclined. I think. The hardest part on this seems to me unbolting the exhaust from the manifold. really. LOL Sounds silly but that has always been tough for me on these vehicles. Going to spray it...
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    2003 Tahoe coolant system leak or head gasket leak?

    Thank you and this board is so encouraging and helpful. Two things first. Drivers side valve cover is coming off for a visual inspection and oil sample will be sent out as well unless visual exam is obvious.
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    2003 Tahoe coolant system leak or head gasket leak?

    Just did some cursory searches. This rebuild has the correct symbol ( not the battery symbol ). What do you guys think? https://www.autozone.com/external-engine/engine-cylinder-head/p/nutech-engine-cylinder-head-2ct7/992894_0_0
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    2003 Tahoe coolant system leak or head gasket leak?

    Not sure I want to do this for a head crack. I want to get to the bottom of it first. Thank you though never heard of this bulletin until now. Looked it up and it is real for pin holes leaks I believe.
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    2003 Tahoe coolant system leak or head gasket leak?

    I just changed my entire system including the radiator. It didn't make a difference. I am going to pull the drivers side valve cover and see if number five has coolant around it and send my oil in for analysis.
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    2003 Tahoe coolant system leak or head gasket leak?

    Thanks for the write up. This is enlightening to say the least. Now somehow, I have to find just the kind of Cylinder head.
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    2003 Tahoe coolant system leak or head gasket leak?

    Thank you for this write up! It rarely is easy is it? Thanks again this is a good starting point for me.

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