If the crankshaft had enough spherical graphite nodules in a specific measured area, it was deemed to have a "high nodular content" and was used for Hi-Po assembly. The rear counterweight was polished and then checked with a microscope. As such, each Hi-Po crankshaft from these small runs was checked visually. This would give the crankshaft increased nodularity, but it was far from an exact science. According to Bob Mannel's excellent book, the Hi-Po cranks were made in batches with higher levels of nickel and magnesium added to stock 289 crankshafts (they did use the stock casting mold as well). While this was true for the block casting, the crankshaft was indeed a revised part for Hi-Po use. It has been reported time and again that the Hi-Po's crank was nothing more than a cherry-picked stock crank, inspected and deemed "perfect" for use with the higher revving Hi-Po. It does not store any personal data.There are some differences in the connecting rods, crankshaft, and pistons used in the Hi-Po 289's assembly. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies.
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