Titanium connecting rods for sbm 416

Ok, so now we know stock block, 6500rpm, 500ish hp, and 10-15yr reliability.

At 6500 you should be making a lot more than 500hp. So maybe step down to a 3.79 crank. You'll still easily hit 500hp well before 6500 and it should live quite a bit longer than a 4" crank. You'll have a more stable piston package, less side loading on the block, and lower piston speeds.

Knowing the parameters now I would be much more concerned with proper machining than exotic parts.