Chevy 5.7 manifold leaks

Answer 1

It is a common flaw in the 5.7. Some say put there on purpose to drum up business for the Chevy garages. I never heard anything officially from GM, however, I always thought it odd, that they go out like clockwork, and on everyone of them. At the rear of the motor, the intake manifold buts up to the cylinder head, and water transfers there. The gasket, (a piece of soft material sandwhiched between two pieces of metal to bridge irregularities of the two surfaces) fails in this area, thus leaking water, only under pressure. Not when cold, but hot only. The vehicle is moving, so no puddle. When it is cold, it does not drip, so no signs, in the driveway. Having to add water, on a consistant basis, is a sign. A sweet smell when shutting motor off, and getting out, would be another. The motor running hotter than normal, would be a third. And, it seems to happen every 50,000 miles. At Chevy, I used to charge right around $275, for the process, and the vehicle had to sit overnight. If you choose an outside shop, used one recommended, as this can ba a tricky proceedure.