Brake Drum Wheel Cylinder problems of the 2008 Chevrolet Corvette

I was concerned about excessive valve train noise and after reading several Corvette forum threads about improperly machined heads by gm's supplier linamar, and that numerous vehicles have had valves drop and ruin the engines, loosing a valve while driving will result in loss of power ssist for steering and breaking while on the road . I took my car with 13500 miles on it to a Corvette specialty shop to have my valve guide clearance tested. I had (8) exhaust valve guide and (3) intake valve guides outside of service specifications, and a combination of (5) other intake valve guides at or near the maximum outside of service specifications. The car is being repaired with proper re-machining of the heads to make the valve guides concentric, new intake and exhaust valve guides installed, as well as new seals, valves, springs, etc. I can provide data on the failed guides for documentation 88% of the Corvette forum members who have had their cylinder heads tested for excessive valve guide wear, were out of service specifications. . Read more...