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I have AMG spec cams available, should have my duplicate AMG headers done in the next few weeks. We are also going to offer a package of a Very hot cam with mechanical lifters in the future.
I do not believe these will work on a 420 however..M116 blocks have some important differences over M117's.
If you want to make your 420 fast I would first sell it and buy a 560.
Hopefully in the next year or so I'll have my TT kit available...and should be making upwards of 500hp.
Jonathan
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