010 Hi Po Engine Id Guide
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Ford used this small counterweight slipped over the nose of the crank to move more counterbalancing closer to the core of the engine to reduce crank flexing for the Hi-Po version of the 289. The Hi-Po 289 used a special timing chain set and gears that were narrower than the base 289 to allow room for this counterweight while still clearing the stock timing cover. View Related Article
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