High mileage LS1 help
I finally got my dream car. An 02 WS6 M6 back in April. Unfortunetly the car has over 125K on it. Previous owner drove alot. I've noticed lately that there is a tick with the engine. It actually started right after I was showing off for my brother in law the day after I got the car. I hope it's something in the valve train. I'd like to at least pull the pushrods and check the rockers. So I have a couple questions.
#1 How difficult is this compared to changing spark plugs?
#2 Are the instructions in the Haynes manual correct? (i'll post them if you want)
#3 Should I go deeper and pull the heads and have everything checked out?
I have limited experience with these engines and don't have many tools. I managed to do spark plugs myself and I do all the routine maintenance on my vehicles. Any thoughts you can give me are much appreciated.
I also notice that when I step on it getting on an on ramp I get some kind or rattling noise that I keep assuming is a heat shield. Could they be related?
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(thats what i always recommend)