Heat riser torque specs. for a mercrusier 170 hp 3.7 L

mercrusiermama

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Need help with a 1986 mercrusier 3.7 L 170hp. 4cyl. Changing the gasket for the heat riser, bolts to the exhust manifold. Can anyone tell me the torque specs. for the heat riser bolts? Thanks again.d:)
 
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