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I do my own valve adjustments and did mine at 600 as called for. The exhaust was .008 (as many of you have also reported) and satisfactory. The Intakes were .002 (or .003 can't remember) and I adjusted them to .005. Point of all this is that a friend of mine with a 400 and nearly 7000 miles (in a little over 3 months) had his "serviced" by a dealer at 600 but no adjustments since. He had been suspicious that the mechanic had not done the valves since his answers to several questions about what the gaps were, and how certains parts were removed, were met with vague answers.
Well, today after doing his valves we are both certain that they have never been done. Not a nut, screw head, hose clamp, etc, etc, showed any signs of ever being touched.
The bad news is that he paid for service he never received, but the good news is that the gaps on the exhaust were at the good ole .008 and the intakes were .002.
Whether or not the 600 adjustment was ever done, this tends to show that the gaps are not changing much, and this is good news. I have 2900 miles on mine now and will do the 4500 service as suggested. If the gaps are within specs, I will extend the next service somewhat.
Would be interested in what any of you that do your own valves are finding after several thousand miles.
Well, today after doing his valves we are both certain that they have never been done. Not a nut, screw head, hose clamp, etc, etc, showed any signs of ever being touched.
The bad news is that he paid for service he never received, but the good news is that the gaps on the exhaust were at the good ole .008 and the intakes were .002.
Whether or not the 600 adjustment was ever done, this tends to show that the gaps are not changing much, and this is good news. I have 2900 miles on mine now and will do the 4500 service as suggested. If the gaps are within specs, I will extend the next service somewhat.
Would be interested in what any of you that do your own valves are finding after several thousand miles.