Did the gasket blow in the first place because of blocked crankcase ventalation bud i had a veccy z18xe once and oil burned quicker than fuel coz of the blockage to the throttle housing(breathers) grey smoke could be the s***e burning out of exhaust now it has more exhaust flow bud..i also took cat off and soaked it so i knew i didnt have bad back pressure..good luck mate
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