so i did no name calling in post 46,but it,s ok for you to call me ASS ******* STUPID,dude,maybe that,s how you roll,like i said,you are pathetic.and i certianlly hope that you saying that i dont know what you are capable of is not a threat to me,if it is let me know.

You have a problem - GET OVER IT. I don't give a dam about YOU - But when You come on here and start calling me names I am going to defend myself.
I would think that if that engine was running with low enough octane or too much advance to do that much damage to one piston it at least would have done some damage to other pistons. Did any eyebrows on other pistons get deformed? What caused just that one piston to melt or detonate like you say? Sounds like the injectors have been checked and it sounds like the ignition was not the problem. did the spark plug come loose. the only one offering an idea that could cause just one cylinder to melt down was my suggestion to look at the header.
If you are such an expert than tell us what caused the meltdown on just that ONE cylinder.

mtuned,after you repair the engine damage i suggest replacing the cap and plug wires,it is posible that the cap has an internal crack or carbon tracking causing that cylinder to fire at the wrong time causing the detonation,it is also posible that the energy from a plug wire is jumping into another wire,i know this sounds crazy but i have seen it hapen with msd wires that are 3 or more years old in a marine envirement.

Ok guys after looking at the op pics, It looks like the damage started around the intake/eyebrow area and burned around the top of the piston toward the exhaust valve side, so why would it start there near the cooler side of the incoming air charge? I don't have the answer just bringing up an observation. Could it have a small crack in the cyl head? Steam jet cutting into the piston and once it penetrates to ring it self destructs? don't know what are your thoughts?

Might want to look at the head gasket between the cylinders.

What do you guys think about this for fuel setup.
3L Surge Tank Twin Fuel Pump Bracket Genuine 2 x Bosch 044 Fuel Pumps | eBay

And a single Walbro 255 feeding that?

Mtuned... clean your PM inbox... its full

Cleaned ! Teamsynergy

Why not just run a single aeromotive or Weldon pump and eliminate all that poppycock?

Because that's the thinnest part of the piston and that's where it starts to melt.....