Something you should know about Woods lifters. 

Did you know that the center oil channel is bigger on the Woods lifters?  This is for big lift cams. When the lifter reaches TDC ( top dead center) of lift this keeps oil to the cooling jet on twin cams. Almost all other aftermarket lifters do not have this and it blocks oil to cooling jets. One other key feature is there is a oiling hole above the roller to keep oil to roller and cam. 

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