Just noticed the discolouration around Cyl 6 inlet manifold when compared to the others, however 1, 2 & 3 look brighter than 4, 5 & 6?
it looks as if there is a hot spot for some reason, especially around 6. Car runs absolutely fine, so is this normal or do I need to check anything?
last photograph is how it was some 4 months ago, all seem balanced in colour 🤷♂️