318 connecting rods

AL rods have a malleability that iron rods dont have. Think of it as a very slight shock absorber for your crankshaft. They can be alloyed to run on the street for some time now (Bill Miller rods). With I and H beam rods available for under $500, I think that is a wise foundation with a forged crank. I would go farther and say the weak link in the bottom end is the rod bolts themselves. I think the one upgrade for the bare bone budget build is at least 180,000 psi rod bolts. ARP, Milodon, Pioneer, etc.

as for composite rods...Naimo tried raising crowd sourced funding for them in 2017, this is what I found...CLOSED. Maybe the crowd source funding didn't go ever well.

LS Carbon Fiber Connecting Rods: Naimo Composites
Discover the Future: Lighter, Faster, Stronger!
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Chris Naimo
1 Campaign |
Roxbury, NJ, United States
$125 USD 2 backers

0% of $175,000 Fixed Goal