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          Rick:
          What are the pistons?  weisco reverse dome, ross reverse dome, 
          or stock harley?  Unless you use a reverse dome pistons like a 
          weisco you will run into high compression problems 10:1+ or 
          more unless you also have the heads (combustion chamber) 
          relieved to adjust the compression back to 9.5:1.  Normally 
          using one of the popular 1200 piston kits, you would use a 
          .015 base gasket(standard base gasket) and a standard head 
          gasket, things will be fine.  When machining the heads and 
          cylinders one must be careful about any alterations on 
          cylinder length or removing any material on the head face. 
          Clearances are very close in the combustion chamber, i.e. 
          relief's cut into the stock pistons for valve clearance.  You 
          should always use either clay or solder placed on the piston 
          top to check your piston to valve clearance.  The other thing 
          one has to be concerned about is the area between the piston 
          top and the head at the edges, (called the squish zone).  This 
          makes the deck hight a critical measurement in that you need 
          this "squish zone" to be close but not too close. ( I don't 
          have the figures right at hand. Check "The sportster 
          performance handbook"  for a complete discussion on this.  
          
          However if you are using one of the popular 1200 kits, usually 
          you don't have to worry about this.  The proper gaskets, 
          (thickness) are provided or the after-market shop provides 
          then and everything is bolt-on.   
          
          Several magazines and the sportster performance handbook all 
          describe this upgrade in detail..  Usually the kits also have 
          detailed instructions.
          
          Good luck... 
          Rich Leonard
          Sporties Forever


______________________________ Reply Separator _________________________________
Subject: Deck Height
Author:  XL Mailing List <xl-list@mansfield.cns.ohiou.edu> at Internet
Date:    3/24/97 1:17 PM


     Having just received my cylinders and heads back from the machine shop 
     after being bored for a 1200 conversion on my 94 XL here's my 
     question; is it necessary to measure the deck height?  The machinist 
     told me no that this is a bolt on application.  Any comments or 
     experiences would be appreciated.
          
     The mods include machining the cylinders and matching to flat top 
     pistons, the heads were also clearanced to match the cylinders.  The 
     rest of the engine is stock.
          
     Thanks
          
     Rick
          
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Subject: Deck Height
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