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Test compression no matter what. If the numbers are low and/or off 10 percent from each other than the lower unit is the most valuable part and you should look somewhere else. Price on a motor with 120 psi versus a motor with 100 psi will vary. Also the area you live in makes a big difference. So $250 to $800+ depending on local market.

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11y ago
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Q: How much is a 1978 mercury 70 hp boat motor worth?
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