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In general, the stock 289s of that era were not high revving or high output. Mine's a 4-barrel and rated at 210hp, at a time when that was crankshaft hp on a dyno under ideal conditions. It's a marine conversion, with the original hp rating at 4,400 rpm.
The Ninja 250's pistons and rods are a small fraction of the weight of the 289 Ford's, so it's not surprising to me that the rod bolt torque spec is not high.
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