UT calls the MFG constraint (of cast steel rods) a "design flaw" whereas it was a corporate edict to be the performance constraint.
Think about it: Chevy being the cheapest vehicle line gets forged cranks & rods, whereas PMD leading the 1960s SALES RECORDS was constrained to cast crank & rods.
Was no wonder to me back in the 80s to why every production V8 was "design-limited" to 150% of stock HP, by virtue of block thinning in key zones, or oil delivery.
Bad enough that all the heads had "exhaust crossover" which super-heated the headgasket zone, and carb. Seemed benign when in put-put but Overkill when getting along with extended foot pedal.
Overall, the BOP 10-bolt rear constraint is a laugh, whereas GM's 12- bolt was top-shelf. Dana60 being just right. Nowadays the rear are much more stout for less TQ and HP in SUVs, flyweight mustangs, and the 90s Towncars, Continentals, etc.
Is why we make the modifications.
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