I imagine more would be achieved by taking the deck down a tiny bit and then the straigtening of the head surface..depending of course on valve travel and where the piston is at TDC. but I'm not about to rip apart my 4.5 when I get it to find out. so I'll have to leave well enough alone on this one

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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