Anybody break a stock block, if so at what hp?

moper said

Filling it, or 1/2 filling it, really changes the breaking point. My comments are about full wet factory blocks, and no boost. With a fill they'll go a bit higher as long as the walls are good and EFI turbos especially make "safe" power. Those engines will far exceed what a N/A or N2O engine can do.

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Mine has no filler,,,might do a refresh with new rings this winter, gap for spray and hit with a 150 shot,,,see what happens :shock: For 150shot do I even need a different gap? I sprayed a couple late model mustangs with 125-150 shots with no issue.
My machinest said he had never seen a better 340 for cylinder wall thickness, and minimal coreshift from casting (that sound right, it was 3.5 yrs ago?) in his 30yrs on the job. So hopefully that a good sign. And if you were curious its a '73 block.
Sorry if this is semi-highjacking.