Weisco pistons have cracked on a few builds now to date. Seems the oem ones are a bit more robust than initially imagined. If your bore is still 81 or 83mm you should be fine swapping stock t5 or R pistons with your upgrades rods.

 

To be fair, there are far more builds done with Wiseco pistons that have not had issues, so I'd be cautious about sweeping generalizations. You made a comment in another thread about "oiling issues and knock" in B5244T5 engines which I also thought might have been a bit broad. You have so much knowledge and experience with Volvos that your opinion carries weight on this forum, all the more reason to be prudent with how you opine on such matters. This is how incorrect information and exaggeration of isolated occurrences becomes gospel and can impact how members of the enthusiast community approach repair decisions.

In this case, the OP provides little to no factual detail about the other aspects of the build, the tune, nor the circumstances that led to the ultimate problem. No photographs, no data, just conjecture.

I know you're (as always) just trying to help and impart some of your ample knowledge and experience, but I'd encourage you to be less flippant and definitive with such declarations.

 

^^ Agree on both

Have seen both stock Mahle and aftermarket Wiseco's or JE fail. All under different circustances.

Have to admit though that over here we stopped using aftermarket pistons if we don't have to.
Stock pistons have proven to withstand +500hp without any issues in numerous of our builds and dozens of others in the past decade.

Cant conclude anything without additional info, stock or aftermarket, neither should be bad.

 

This is fascinating thus far... P80 awesome. I like that 850R

 

Swapped a B5244T5 in my car, but before running it I checked and replaced rings in the oil pan because its a known problem.

Have one case of rod knock in my group.

If you take care of these engines the right way this shouldn't be a problem.