20psi stock 5.9 carnage

Dale Davies said
What is your block, 2bolt or 4 bolt. Check David Vizard Powertec 10 episode that discusses building the SBF 5.0 block to handle up to 1,000HP. These blocks are known for breaking at over 500HP. One thing DV tells iis a machine shop that will modify the mains for 4 bolts with registers machined in to lock the new caps in place. This is done to any make bolck. It is likely a bit expensive, but less than blowing the rotating bits out the oil pan and side of the block.

That figure is an old wives tale. At least the small block Chrysler one. A small block Chrysler will live at 1k HP forever as long as it doesn't get into detonation.

TT5.9mag said
Not my block, these are videos from another member here. And adding 4 bolt mains to an LA block only weakens the the webbing around the main caps. It’s not a suggested good practice. Plus that’s not where the magnum (or LA for that matter) fails when big power is applied.

Categorically I agree with you but my original turbo motor made 1222 at the tire with 4 bolt splayed caps. In addition to that My Duster has them too and it made 900 at the flywheel with a 250 shot of nitrous, at that short block is 23 years old with about 400 passes on it.