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What determines connecting rod clearance?

Updated: 8/18/2019
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14y ago

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The block casting. If the engine is in the vehicle this will be harder. Preferably the engine is on an engine stand and turned upside down with the block skirt facing up. Remove your oil pan and with your rotating and reciprocating assembly's installed, bar the engine over. Watch the the connecting rods as they travel, the tops of the rod bearing end (where the rod bolt caps are) will come close to the the bottom end of the cylinder. The stock crank has a throw that keeps the rods away from the cylinder so if you stroke an engine you may run into clearance issues. You may have to take the engine to a machine shop and they will relieve the block (i.e. they will remove a portion of the casting that is interfering with rod/crank rotation.

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Q: What determines connecting rod clearance?
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