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Buell.. and there's always room for improvement. You'll need to use matching pistons also.John
we get more air starting with the buell heads than the SE heads,but youve already got the SE heads and you really dont want to do headwork anyway,so its kinda a moot point
The XB have bath tub chambers, bee-hive springs which handle higher lift cams (~.570"), out flow the Tstorms, and have less issue with valve to valve clearance than the Tstorms. If the SE's that you have are the same as the XB castings as Jimlibo suggests, you have a really good set of heads.
"If the SE's that you have are the same as the XB castings as Jimlibo suggests"I didn't suggest they were the same, only pointed out that the 55cc SE heads as Frisco14 suggested ARE a "derivative of the XB heads". The base castings are identical but there are subtle differences between the two ASSEMBLIES (other than the -.050") deck. Most notably The valves, spring pack and spring pad locations. Due partially to the valve differences they also flow a little less air than the XB assemblies. I mentioned this on another string by the OP. There has been a few minor running changes in these assemblies as well.
STD castings with the raised ports and spread valves are good castings to start with. There are a bunch of STD XR style casting floating around as well. Also, not very hard to convert big twin heads to run on XL cases. Port and chamber work are similar but the pushrod holes have to be relocated. Most any big name head shop can relocate those holes. No need to limit your search to only XL or Buell heads.
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