What is causing my newly rebuilt vortec 350 to start to knock 3-4 times on start up after sitting for 10 minutes or more? It then goes away and runs smooth and quiet. It started after 600kms.
Is it a ping or a knock? It could be the initial timing is not set correctly. Are you losing coolant? It could be a leaking head gasket and is leaking a small amount of anti-freeze into one of the cylinders. If it is a bearing it will get worse and worse, is the oil pressure good? I guess I'd take it back to the rebuilder.
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