[Bow Tie 67]

So I pulled the pan today and spoke with ARP. They said there is no way of telling if replacing them would throw the rod end out of round. ( cracked cap rods are not resized ) I have the bolts, but I'm vacillating on if I should proceed. The engine is an 08 6.2 with SPS 12.9 bolts from the factory. I read somewhere that GM had upgraded the rod bolts sometime in the last few years. I have 5k on the engine and she put down 420 at the rear wheels, I do plan on making more power in the future.

Opinions?

What level of power is safe with a stock short block?

Edit:

Here is what I found, stock 12.9 bolts have an equivalent strength of 156,600 yield & 174,000 Tensile.

Arp 234-6301 bolts are 180,000 yield & 215 - 220 Tensile.

Increased rpm redline is the main cause of rod bolt failure.

I have decided to go ahead and replace the bolts. I will be using a stretch gauge, ( most accurate method ), and only loosen one bolt at a time.