My experience was with a 56 GMC with pontiac v/8 316 ci. Early on like 56-57 we found the draft tube was pulling out oil. Like 3 qts in 180 miles. At least that is what we were told by mechanic in GMC dealership. So he pulled the draft tube up a bit and seemed to solve the problem. He also placed a bracket on the tube to prevent it from going down in to valley cover. It does fit snugly into valley cover. good luck!
