GM USED 3 DIFFERENT CAMS IN THE 302 Z28 ENGINES. THIS IS THE 03965754 2nd OFF ROAD DESIGN. THIS WAS THE CAM THAT WAS OFTEN USED ON A CROSS RAM SET-UP TO GET THE ENGINE AWAKE AFTER 4,000 RPM RANGE....NOT AN AFTERMARKET CHINESE PART AND DEFINITELY SHOULD BE USED WITH THE HARDENED FOOT CORRECT LIFTERS....OR JUST KEEP BELIEVING YOUR OIL IS THE PROBLEM LIKE JUNK PEDDLERS TRY TO SOLICIT.  VERY RARE OVER THE GM COUNTER PIECE THAT WAS STORED SINCE THE 80’s. PLEASE ASK ANY QUESTIONS BEFORE PURCHASE…THIS IS A NOS NON-RETURNABLE RACE PART THAT IS EXACTLY AS DESCRIBED.