CJRando
January 16, 2011, 7:37pm
30
I suspected as such, common again. Usually happens when people fail to bleed the coolant system properly and get localized boiling in one area. The casting is thin and doesn’t take much deflection to crack.
It can be repaired and we can certainly take a look at it for you. I will not be at the machine shop until later in the afternoon but Scott will be there in the AM and will be able to look at it and give you an idea of the work required. Being that it’s near a seat though, the seat will likely have to come out and be installed after the work is complete, which leads into a valve job. Scott can go over the details with you. Can’t E-diag this without seeing it.
Typically the head would be repaired and rough machined, then pressure tested thereafter. Zyglo’ing the head will also show any other cracks that may not be visible to the eye and that may not be causing a current issue, but would eventually lead to a future failure. We can do this as well.
I do have another S50 head I picked up for measurements but it’s going to required a few valves and a seat or two with a valve job, but is not cracked. S50/S52 heads are all the same casting anyway.
How much would you want to sell the other head for? Where is your shop located? I suspect this head probably has more cracks. I may just be better off getting another one.