Mopar Performance Roller Rockers

Aluminum alone is in general a poor performer as a plain bearing material compared to bronze or other materials. You will never see a aluminum used to bush a steel part unless there was no other option or the person doing the work didn't know better. Will it work, maybe/probably. Is it a better choice than bronze? Absolutely not.

Then why don't all aluminum pistons have bronze bushing inserts? Or aluminum connecting rod pin bores? Or main and rod bearings for that matter? That is why I question it.