The SOHC/4 World Tour is in under way.
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Yes, some of the threads have been helicoiled. I'm afraid I will have to search for a replacement head, which is very hard to find here, in Spain
What you mention makes sense, I mean, about the pressure. I installed HD studs on this engine, and given they are larger than the original ones, I thought that it would be more difficult for the oil to pass through the holes, resulting in bigger pressure, but I've read about a lot of rebuillds here and never read a problem about HD studs related to oil restrictions, so I forgot about it.But I think that the problem on my engine is not related to pressure, because when I dismantled the head (after all the leaks), the head gasket was absolutely clean, no oil came through it. Even the cylinder fins were clean, near to the gasket, they were dirty on the outer sides, from the oil that was dropping from the head, so I am sure that the leak is not from the head gasket.All the leaks come from the head itself, from the front side, and I suspect that from the holes I signaled on the picture, so I will use RTV or teflon paste, as MRieck suggested, there.Thank you very much for your help.
Rather than helicoils i have used "Keenserts" which used a standard (But odd pitch) tap and then used a Lock N Seal on the outer thread with a TINY dab of silicone on the bolt thread.I have had porous castings before now but its rare
Yes, I had read this post yet. Before assembling the engine, I think I read all the posts related to F2 engines, I'm too anal.But the problem doesn't come from there. If you forget the 0-rings, for sure you will have oil leaks, but they will come between the head or the cylinders, or through the barrels fins.But the problem on my engine is that the oil comes from the head itself. For sure is passing through the holes made on the head for the cam towers bolts.jtcb750K6: I thought about tapping these holes. I wonder why Honda left them open. Given that the head has been dismantled, maybe I will take it to a machine shop to have them tapped with welding.