It didn't melt because it was built wrong, it was either mapping or another failure of some sort which led to the engine melting.

Has Mike R's car melted ? I certainly don't see Andrew Gallagher complaining about his engines

I don't for one minute hold anything against Karls engine building or mapping though

Lets be honest though Dingy, your seriously over specced engine couldn't even make 500hp a month ago, no wonder its been safe with a spec like that running only mild power

400hp can be done on a stock engine by just adding a few components, thats if your only looking for a figure of 400hp. If you want a nicer power delivery etc.. then you would need to start thinking about getting a cylinder head done and other bits BUT you can and it has been proven several times make near to 400hp on a stock engine