Thats the answer i was looking for, thank you! My camera arriving tomorrow, hoping to see something (want to see no cracks🤞) if no cracks then its the gasket or warped head.I would agree with the guys and imagine its the head gasket. I had similar setup to yours, forged internals and linered block, running around 370 bhp and my head gasket went 2000 miles/ 6 months later. No reason i can think of other than the head gasket might have had an issue when installed or head itself and went one day when i was pushing it hard maybe? The car had no symptoms apart from an initial misfire and bit of coolant loss. I'm pretty meticulous with the up keep of my cars and had only replaced the header tank with a new one a couple of months earlier, due to it getting mucky from the split liner and a couple of days after the misfire,i checked the cars coolant level again and noticed the header tank had now been contaminated and instead of a nice red/pinky colour it was now murky and emulsified. I did the hydrocarbon test just to prove the obvious but after it failed the pressure test, had the head off and skimmed. Can only assume it was faulty parts or workmanship, as the car had never lost coolant or over heated.
1k should be enough for head skim, new gasket and labour along with full service..
Will update my findings when camera arrives 🤞🤞🤞