Originally Posted by MBTEK

Dtb # For Engine 156(63) Motor Is P-b-05.20/20. This Dtb Applies To Engines Built Up To Serial # 60 001177,the Dtb States A Sporatic Noise When Starting Warm. The Cure Is To Get Kit # A156 050 31 47, This Kit Contains 2 Intake Cams And 2 Intake Cam Adjusters. Follow Directions As Per Wis Document Ar5.20p-6992amg. This Info Was Released Jan4/07. Hope This Info Helps.