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10,982 Posts
When you upgrade and add 200HP to the stock short block, the powdered metal rods, rod bolts and oil pump with powdered metal gears get marginal. Here is a pic of a 5.4L short block that #5 rod broke at ~4,000 rpm. Rod sheared in two and piston wedged in the block with the rod punching two holes in both sides of the block. A new MMR 1,000 HP short block now resides in the car.

