I HAVE A B16 HEAD FOR SALE IT COME WITH A GSR HEAD AS WELL BUT THE GSR HEAD IS SCORED DONT KNOW IF IT'S FIXABLE I HAVENT TAKEN IT TO A MACHINE SHOP YET, BUT I DOUBT IT. THE b16 HEAD IS PERFECT JUST MISSING VALVES THATS WHAT THE GSR HEAD IS FOR AND GSR HEAD ALSO HAS EVERYTHING IN IT. IF INTERSTED GIVE ME A CALL, 407-489-3884 ASKING $350OBO