My 5.3L engine lifters and camshaft have worn so that the engine misfires. I understand from other posts that some believe that the active fuel management (AFM) system has led to that type of failure. So, I am desiring a bigger engine. I am interested in replacing the 5.3L engine in my 2011 Silverado with either a 6.0L or 6.2L engine. I am interested in knowing if the engine mounts are compatible. Are all 3 of these size engines from the same casting (block size)? Are the intake manifolds compatible? Is the belt assembly compatible? If you are familiar with any of these aspects I would appreciate your input. I am hoping to purchase an engine that I can take the belt assembly and the intake manifold from the 5.3L to either the 6.0 or 6.2L engine. And, of course, use the same engine mounts.
I have a 2011 Silverado with 5.3L. at 75,500 miles I had no issues and averaged just above 17mpg. At 76,000 miles the check engine light had a code of P0305, which is misfiring on #5 cylinder. I have followed all of the manufacturers' maintenance requirements including the oil changes to the specs. Auto shop opened the manifold on the driver's side and it smelled like a dead animal, oil had silver specs and the lifters were worn so much that they would not hold their position. Seriously, disappointed in the 5.3L engine with the fuel mgt system. I am glad to hear about your success. I need to pursue the fix.
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