I'm putting a new injector in #3 on my '02 GMC and I wondered if I ought to run the overhead while I've got it somewhat apart. I know I'll have to take off alot of other stuff on the passenger side which isn't where I'm replacing the injector but the truck's got 240,000 miles on it and I'm just thinking it wouldn't hurt to at least check the valve clearance. Anybody got some input?
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