Leaking header, but not a crack
#11
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1Moses1, what you say makes good sense, but the OP’s failure is at the turn on the runner and nowhere near a weld. In this case I don’t think we can say “That’s what headers do.” I’m pretty sure he had another issue by the looks of his pictures. Has anyone else seen something like that in the middle of the runner? Also, it’s in the outside of the bend, not where you would expect water to collect and eat through.
#13
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1Moses1, what you say makes good sense, but the OP’s failure is at the turn on the runner and nowhere near a weld. In this case I don’t think we can say “That’s what headers do.” I’m pretty sure he had another issue by the looks of his pictures. Has anyone else seen something like that in the middle of the runner? Also, it’s in the outside of the bend, not where you would expect water to collect and eat through.
#14
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#15
#16
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#17
1Moses1, what you say makes good sense, but the OP’s failure is at the turn on the runner and nowhere near a weld. In this case I don’t think we can say “That’s what headers do.” I’m pretty sure he had another issue by the looks of his pictures. Has anyone else seen something like that in the middle of the runner? Also, it’s in the outside of the bend, not where you would expect water to collect and eat through.
#18
#19
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From the pictures that you have uploaded, I see minimal corrosion and a very hot section of tubing at the outside apex of a runner that most likely lost water flow. Do you have a sea strainer? It seems very possible that you picked up some small chuck of crap that blocked flow and you over heated that spot in the tube. If I was in your position I would get another set of the same headers and add a sea strainer. Stock sh!t sucks and stainless marine is just bilge clutter.
#20
From the pictures that you have uploaded, I see minimal corrosion and a very hot section of tubing at the outside apex of a runner that most likely lost water flow. Do you have a sea strainer? It seems very possible that you picked up some small chuck of crap that blocked flow and you over heated that spot in the tube. If I was in your position I would get another set of the same headers and add a sea strainer. Stock sh!t sucks and stainless marine is just bilge clutter.
If it is a problem with lack of water, have anyone heard if it is possible that an air pocket could have formed at the highest point where the damage are or is it just the weak point for water flow? If it is engine related, even if the 496HO is a mild engine can it due to bad injectors create a lean condition that can cause this? Lean condition due to low fuel pressure should have affected all the runners equal or?