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Which Is Better To Do Hand Grinding Or Machine Grinding On Car Valve

2011-8-4lapping them might cut it but id just tell the machine shop to do what needs done if you go in there telling them what to do theyll do that and nothing more, even if they see something else atleast most of themlapping is last century techont let anyone near your engine who wants to lap valvesf a shop cant do a proper valve.