Can't speak for Vanagons per se, but generally double valve springs
are used to keep the valves from "floating" permanently open at very
high RPMs. The kinds of RPMs that wasserboxers never see.

There are all kinds of racer and aftermarket performance products for
VWs, maybe someone just had these on hand and knew that they would
fit. Makes me want to look through my junk pile to see what my old
heads have.

Jim

On Sun, Oct 11, 2009 at 7:14 PM, Chris S <szpejankowski@gmail.com> wrote:
> Just picked some nice and clean used 2.1L heads today. �They have dual valve
> springs, which in my 9 years of Vanagon ownership I have not encountered.
>
> Can someone tell the history of these? �I'm assuming it's a factory part.
> What would I gain by using these instead of single springs I currently have
> in my 2.1? �Both my and the donor engines are '89.
>
> --
> Chris S.
> Disclaimer: "Death and serious injury may occur"
>