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AFAIK, the 12pt bolts have the same torque spec. We really aren't talking about increased clamp load as being a requirement. Instead, what we need is better fatigue resistance.

Diesels have new inserts installed all the time during an in-frame overhaul and aren't resized. Why would the multi be any different? If the new bolts are tightened to the same torque, what has changed?

Can you just swap them out in the truck? Or, should the rods be resized?

I agree. You can have custom rod bolts made here but they will be the same material as stock: Connecting Rod Bolts from Chandler Products

Happens on cummins, too. Engine & fuel engineering - Cummins 5.9 rod separation - root cause?

This one also suggests that 4140 is grade 8 and that grade 2 is made out of 1018 (mild steel): http://www.rbwmfg.com/images/HelpfulHints2.pdf

I have a hard time believing that anybody would spec grade 2 bolts for a con rod. Doing a quick google search yields this page which suggests that 4140 is grade 8. Hex Head Cap Screws "Made from 4140 steel, these screws meet ASTM A-354 BD, SAE J-429 Grade 8, and SAE chemistry and mechanical...

Excerpted from Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Board - Re: 2-155 cummins conversion I have NO idea if it is accurate. Maybe the tractors use a different rod bolt?? There are some differences in the 478 used in the Army trucks and the ones used in the tractors. The blocks...

Tractor rod bolt $15 each HC40-1091706 - Connecting Rod Bolt | TractorJoe.com

How about a short stud/ nut?

Will this require that the big end be resized or is this a remove and replace?

It'd be great if you could quantify the strength improvement of your rod bolt kit and include a one-piece pan gasket. Should sell itself.

Can you give us a hint of what you are working on?

So, whatever happened with this?