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Q: Can i replace my mercedes 1989 420 SEL engine with a 1986 420 SEL engine on 1990 Mercedes-Benz 420SEL

my timing chain broke on my 1989 420 SEL. Can I use a 1986 420 SEL block to replace it?
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No need to change block, the damage is to the cylinder head valves, it is easier to change the 4 exhaust valves on drivers cam, top tension rails, and new chain, if u would like step by step instructions please e mail me, I have done several. jagclassic2002@yahoo.ca
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