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Rebuilding Chev 350 SMB, once I tighten / torque the Con Rod Bolts, Engine wont turn

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Old Apr 13, 2025 | 1:28 PM
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Robert Se's Avatar
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Default Rebuilding Chev 350 SMB, once I tighten / torque the Con Rod Bolts, Engine wont turn

Dear All,
I am Rebuilding Chev 350 SMB, I got the block professional machined. I installed new pistons and rings, as the Con Rod bolts are ruffed in loosely the engine turns manually (but is still slightly hard). However once I tighten / torque the Con Rod Bolts to Connecting Rod Bolt 38ft.-lbs/ (52 NM), the engine no longer turns. I have attached a video of the engine turning before torqueing the con rod bolts. Please advise what I am doing wrong. Thankyou in advance.
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