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surfacing shock piston

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I had FC revalve my suspension a few years ago and didnt like it so I had the smart performance setup put in by Shocdoc.He said that Fc surfaced the piston and that was a big no no.I had to buy a new piston so he could install it.He sent me back the old 1 and I could see what he was talking about.Why would FC do that?

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it's a old idea that pistons should be flat to ensure the shims sit flat against the piston , however most don't realise they are dished for a reason to add a bit of preload on the stack

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That is kind of what shocdoc said.What kind of adverse affects does that do to the shocks performance.I have been having a problem swapping in the whoops and he said that the piston not having the surface dished out is what is causing the swapping issues.

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it will allow the shims to lift of the piston a little too early in the damping curve , how bad that is, is hard to say

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I just finished read the Race-tech suspension bible. They show how you make your pistons flat. Hmmm what is right and wrong. Do FC and Race-tech wrong or...

Or does it really matter ?

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kyb and showa don't make them flat, they could , it does make a difference

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