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Originally Posted by 1MOSES1
(Post 4499558)
few questions:
1. Are the guides shown the original iron guides? Or replacement bronze?you have bronze replacements. 2. Is it your opinion that the guides are causing the water corrosion on valves, or is it something else?guides are sticking the valves causing the water to come back up 3. How can you tell compression is off? Gasket is mis-shaped? getrdunn,,you are right,,gm had water running around the unprotected exhaust valve guide.plus you have to watch how you take them out,one side of the casting in the head is ever so slightly smaller.have seen a lot of heads that leaked from guide replacement. |
Originally Posted by 1MOSES1
(Post 4499560)
This is the gasket that was used: Head gasket: felpro marine 17048
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Looks like the fire ring is split on the left cylinder of the gasket. This thing is leaking water in the chambers for sure.
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Originally Posted by 1MOSES1
(Post 4499560)
This is the gasket that was used: Head gasket: felpro marine 17048
Originally Posted by sutphen 30
(Post 4499567)
the black on the fire ring(silver portion),,especially betw the cylinders.
getrdunn,,you are right,,gm had water running around the unprotected exhaust valve guide.plus you have to watch how you take them out,one side of the casting in the head is ever so slightly smaller.have seen a lot of heads that leaked from guide replacement. These kind of problems eat away at me. Didn't do it before and does now type of thing. Both engines. ??? Drives a guy crazy. |
Originally Posted by 14 apache
(Post 4499570)
Looks like the fire ring is split on the left cylinder of the gasket. This thing is leaking water in the chambers for sure.
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Originally Posted by sutphen 30
(Post 4499567)
the black on the fire ring(silver portion),,especially betw the cylinders.
getrdunn,,you are right,,gm had water running around the unprotected exhaust valve guide.plus you have to watch how you take them out,one side of the casting in the head is ever so slightly smaller.have seen a lot of heads that leaked from guide replacement. |
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Originally Posted by 1MOSES1
(Post 4499514)
Dropped off heads yesterday with machine shop... his first guess was valve guides. He was right. See picture below. Not sure why this want checked during the first top end rebuild. Would have saved me a lot of time and money.
https://i.imgur.com/3rmvPBv.jpg He is checking other things as well (i.e. Springs, valve job, valves, seals, etc). wow I did not see this that's pretty bad |
Originally Posted by 1MOSES1
(Post 4499573)
Are the guides shown OEM? Or have they been replaced
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Originally Posted by 1MOSES1
(Post 4499573)
Are the guides shown OEM? Or have they been replaced
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