"THIS BULLETIN ANNOUNCES THE AVAILABILITY OF REVISED VALVE TRAIN COMPONENTS DEVELOPED TO REDUCE A TAPPING TYPE SOUND WHICH MAY BE HEARD COMING FROM THE LEFT-HAND (B2) SIDE OF THE ENGINE WHEN THE ENGINE IS WARM. THIS BULLETIN DOES NOT ADDRESS ANY COLD ENGINE OR START-UP TYPE SOUNDS. THE CHANGES
CONSIST OF:
• DESIGN CHANGE TO THE VALVE ROCKERS
• CAMSHAFT PROFILE CHANGE
• INCREASED INTAKE VALVE STEM LENGTH (1.65MM LONGER INTAKE, 2.4MM LONGER EXHAUST)
IN ADDITION, THE INSULATOR PAD HAS BEEN ELIMINATED FROM THE B2 INTAKE MANIFOLD PROTECTOR."
