Here is a picture of an Aluminum (AL) Rod next for everyone's viewing pleasure. The two rods are both for a SR20. We have a couple of sets for the SR20 and a couple for the RB26 left.
Many people I talk to about these rods are hesitant about using AL for a connecting rod, but these are not some cast AL pieces. They are 600t forged and VERY beefy (obviously). Due to the properties of AL, they actually cushion the jolt of the combustion which leads to a longer and happier life for the rod bearings.
The same manufacturer makes these for the domestic guys that make quite a bit of power (over 3000hp = quite a bit of power). Three Thousand plus horse power and the rods last for a season before they're replaced. To level the playing field (V8 -> I4) we'll divide those numbers in half and say a "conservative" 1500hp. I think if the rods can take that kind of power, it'll hold up to a 400hp+ track only car as long as the rest of the motor holds together.
Many people I talk to about these rods are hesitant about using AL for a connecting rod, but these are not some cast AL pieces. They are 600t forged and VERY beefy (obviously). Due to the properties of AL, they actually cushion the jolt of the combustion which leads to a longer and happier life for the rod bearings. 
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