Besides the things the other guys have mentioned, the K-code engine had a dual point distributor and a bottom end with beefier mains and higer nodularity. They were made for high winding. I've got one in my truck and I've had a few 2v and 4v 289's in the past and the major difference I can tell in the performance is as the 4v starts to run out of steam the hipo just keeps pullin and pullin. You can put all the parts into a 289 and have the same breathing capacity but it might not hold together as long.
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