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Hello everybody, so I'm rebuilding the 2.2 L ecotec in my 2006 Malibu LT...timing chain tensioner broke and screwed up the valves...so...while the head was off I took the pistons out and cleaned them and the rings up from all the carbon build up...while doing some research, from what I understand the rod bolts are Torque To Yield and are pretty much a one time use from what I understand...so I ordered new rod bolts....same part number but they are definitely different...I'm wondering if anybody else has ran into this issue before??? I cant seem to find anything out. The one on the right is what came out. The one on the left is the new one from GM.
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If it's a GM bolt I would say it's the factory approved replacement. They make running changes on parts.
I myself have never seen a fully threaded torque to yield bolt.
 

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I wouda thought they should have a shank... i dont remember seeing rod bolts without a shank....talk to APC.com they can help aswell...... they make all the best engine hardware.....and have great knowledge ....all top engines this side of the pond..... use APC hardware.... from ecotec to 10'000 hp blown nitro hemi motors.
 
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