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hippy440
03-10-2002, 09:49 AM
if you used a 12:1 weisco piston with xr head gasket and no base gasket what comp would you have?:confused:

400exJOE
03-10-2002, 10:01 AM
I think that the compression is for the xr400. When I put on my 10.8-1 piston w/ the oem thickness for the 400ex it comes out to 10.5-1. So figure 12.0-1 plus maybe .3 extra for removing the base gasket.