My SystemMax II kit came from Excessive with their Stage II heads.  When they ported the heads they went in to a water jacket.  My new engine ran perfectly until the thermostat opened up.  It filled one of the cylinders up with water and cracked my brand new block.  It also destroyed a new forged piston and rod.  You can see pictures of what happened here:
http://members.aol.com/chadtn/failure.htm
Chad
 
		
	
		
		
		
		
		
		
			
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				78 Regal (stock)
89 Mustang  GT 25th Anniversary (parts purchased, but not installed)
93 Mustang  LX 5.0 ex-FHP car (modified)
02 Camaro Z28 35th Anniversary (light mods)
http://members.aol.com/chadtn