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Hi all,

After a bit of advice on a head that I sent away to have some machining done on. The head has passed a pressure test ok but the combustion chamber appears to have a couple of cracks between an inlet and exhaust valve on cylinders 5 and 6. The engineering company have ground away the surface a bit to check to see if it was a surface crack but it appears to go deeper as shown below :

p1020876.jpg

p1020877t.jpg

Frankly, I spent ages porting the ****ing thing before sending it away so is it repairable or ?

Edited by mambastu
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https://www.sau.com.au/forums/topic/408616-cylinder-head-cracks-repairable/
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To repair it you'd have to gouge it all out, bake the head to remove impurities, and weld the entire affected area up, provided it was even possible, then you'd have heat effected area near weld, then you'd also have stresses built in to it. I wouldn't be keen on repair.

It's a shame you're in the UK, because if you were in Aus I'd suggest sending it to someone here in Adelaide that could pretty near build you a complete new head out of welding rod. FWIW, that head looks completely repeairable, but you'd need to find someone trustworthy to quote on it, because you're going to have to balance the amount of work and money required to pull the seats and guides out of those chambers and do all the prep, weld and refinish against the amount of time/money/effort you have otherwise sunk into the porting and anything else done to the head.

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