You could use a Z20 gasket set on a Z18, but you'd have to modify the 
timing cover gaskets to compensate for the difference in block height. 
There's 3 different heights for L/Z blocks:

L13/L14/L16/L18(W)/Z18 207.85mm
L20b/Z20/Z22 227.45mm
Z24 247.45mm

All Z heads are suppsoed to be identical, except Errol has found a 
couple which have different bolt spacing on the exhaust manifold. I also 
have one with only 4 spark plugs instead of the normal 8.

- Tom

Terry Rudd wrote:

> What are the chances that most Z20 gaskets fit as they're available 
> almost anywhere.
> Also, a Z18 head is identical afaik to a Z20
> I'm pretty sure that a L18 and Z18 block are much the same dimensions 
> but does anyone know if a Z20 block the same height as the L20B - just 
> curious.
> regards
> Terry
>
>     -----Original Message-----
>     *From:* [EMAIL PROTECTED]
>     [mailto:[EMAIL PROTECTED]]*On Behalf Of *mark
>     krawczuk
>     *Sent:* Thursday, 1 August 2002 10:37 PM
>     *To:* [EMAIL PROTECTED]
>     *Subject:* Re: Z18ET gaskets...
>
>     hi, you said they both dont have them..........
>     but can they get them in?
>     the local auto pro doesnt have them in stock, but can get them
>     overnight.
>     mark k
>
>         ----- Original Message -----
>         *From:* Cameron Stean <mailto:[EMAIL PROTECTED]>
>         *To:* [EMAIL PROTECTED]
>         <mailto:[EMAIL PROTECTED]>
>         *Sent:* Thursday, August 01, 2002 8:54 PM
>         *Subject:* Z18ET gaskets...
>
>         Where can I get a Z18ET gasket set? I've tried Autobarn and
>         Coventry's and they both dont have them..
>
>         thanks.
>
>
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