What’s wrong with aluminum rods? Stretch? Wish I could buy this engine but I have stage 1 heads, intake, headers etc. Looking for someone to machine a new block right now. Not many( none ) Buick knowledgeable machinists in Omaha.
Stumbled upon this, thought it might interest some people asking questions. http://www.v8buick.com/index.php?threads/who-is-running-aluminum-rods-on-the-street.205486/
In the past alum rods were typically only used in race engines as they had a limited lifespan. Modern tech has improved a lot and now there are people using alum rods for long term street use.