Can't say there is, there's not much to take away between valve pockets or
anything like that. .
It's use thicker rings at the top of the piston barrels.  ( or double rings,
but that seems shaky )

or different pistons.
or............and this would not be impossible for a half clever electronics
wiz to adapt - Knock Sensor Ignition.
And the timing has been moved back a lot ?  and it still does it ?

----- Original Message -----
From: "Ian Allan" <ian.allan@BMTS.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, September 15, 2009 8:04 PM
Subject: 2.1 heads

>I have a friend who purchased a van with a Go Westy 2.4 engine. The
> engine has suffered from detonation issues among other things. Any
> ideas as to practical machining processes to REDUCE the compression
> ratio?
>
> Ian