10v -> 20v -> 20vt

[james accordino]

This is based on previous NA experiences, but I
believe the only problems come from "valve float".
Based on how aggresive your cam ramps are, the state
of the valve springs, and mainly how high you rev the
engine.  The valves briefly leave contact with the
followers or rocker arms and CAN touch the tops of the
pistons.  If you don't plan on exceeding the springs
capability to keep the valve stem tips in contact with
the followers, then the clearances can be very
minimal.

Just my $.02
Jim Accordino

--- Marc Swanson <marcswanson at mediaone.net> wrote:
> > I have a 20v head bolted to a block right now, I
> will use clay on the
> > pistons to get a feel for the clearances, I will
> let you know if a week or
> > two.  If the NG pistons need much relieving, it
> may not be worth it, maybe
> > a little nick here and there, ideally they
> wouldn't need any.
>
>
> How much clearance is needed for wear/flex/etc?
> Keep us updated :-)
>
> Later
>
> -Marc-
>
> 87 4ktq
> 88 90q


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