It's like a nightmare that just keeps getting worse. On a hunch I did a leak down after removing the cams. (So all valves were closed) I never turned the engine over this time. After bolting the valve cover on, the broken cam locked up so I pulled it back off. Timing mark on TDC. Left head had at least 1 bent exhaust. The left head I installed with the timing pointer in the correct phase but the end of the broken cam was rotated out of phase.
The right head had 3 bent exhaust valves from when the last engine failed. During the last failure I posted questions extensively on the 928 boards. Everyone reasurred me the valves in my shaved heads couldn't have hit the pistons with the thick gasket. So I was convinced it was ok and didn't have them checked.
So much for non interference theory... Remember, I never even started the engine the last time. Only cranked it with the starter. These heads were fresh.
BTW: On a lighter note, I didn't find any "S" cams at the usual retailers. One of them stated if he had one it would be 650.00 and if he sent to germany for one it would be more...
So I sent my broken "S" cam and a good US cam to Berry Cams here in MN. He thought he may be able to weld the US cam and re-cut it to match the broken euro spec "S" for around $ 300.00! It sounded like he thought that was alot of money. Compared to unobtainium.... not so much.
So, I'm moving on to repair this thing, I already pulled the heads. Their on their way to the machine shop.
For those that don't know, a 4.7 US engine is 218 HP
The euro "S" 4.7 is 300 HP (which is what I started with)
The 5.0 Hybrid I'm building now I'm told makes 350HP This comes from the big 16 valve "S" heads, "S" cam profile, larger spyder and bigger throttle body of the "S" engine. The 350 is to the wheels in a 928 turning all the extras like AC pulley,PS pump, alternator, machanical fan, etc.
So the journey will be worth to outcome. I hope.