Mill some off the piston tops.

  ----- Original Message ----- 
  From: Ian Allan 
  To: vanagon@GERRY.VANAGON.COM 
  Sent: Tuesday, September 15, 2009 11:04 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