During a recent throwing session by Tigers' top prospect Rick Porcello, two men holding radar guns in the bleachers behind home plate could be seen shooting each other knowing glances, shaking their heads, and letting out low whistles after each pitch. 'Kid's got an arm,' one man said while lifting his hat and scratching his head with the same hand just before spitting a stream of tobacco juice between his teeth. His companion, a large man in suspenders who punctuated his comments by mopping his brow, seemed to agree, remarking that he had 'been around for a long time' and had 'never seen anything like it.' The men went on to remark that they had not seen an arm like that since Yankee great Steve Nebraska or Cubs great Henry Rowengartner. 