I have the same mate, and from what I found on here quite a few people running the same pistons and rods complain of the same noise. I checked heaps of things, Inc valve clearances etc and they all seemed fine so I've basically put it down to being this combination of pistons and rods. Same as yourself, I've ran mine in and given it a fair bit of stick and she still runs perfectly so I will wait and see the view the mapper has on it when I go down with it. John