454 (Bent) PUSH ROD or (Collapsed) LIFTER or (Flat Lobe) CAMSHAFT? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

savatreatabvr · 10-23-2012, 03:53 PM

My mid 70's 454 was running really rough, like on 7 cylinders so I replaced the plugs, wires, cap & rotor, set the timing and adjusted the carb but no change! I decided to adjust the valves, (running adjustment) and after loosening and then cranking down the rocker arm nuts around 1/2 turn each after zero lash I noticed one of the push rods, (only one) was spinning! Well since it was running good I figured it was alright so I put the valve cover back on and went for a drive! After about 10 miles or so it gradually started running rough again, they were all adjusted correctly and none of them were clattering so how could this happen? Could the spinning push rod be the culprit and if so, why is it spinning?

10-23-2012, 03:53 PM	#1
savatreatabvr Registered User Join Date: Oct 2011 Location: phoenix, az Posts: 508	454 (Bent) PUSH ROD or (Collapsed) LIFTER or (Flat Lobe) CAMSHAFT? My mid 70's 454 was running really rough, like on 7 cylinders so I replaced the plugs, wires, cap & rotor, set the timing and adjusted the carb but no change! I decided to adjust the valves, (running adjustment) and after loosening and then cranking down the rocker arm nuts around 1/2 turn each after zero lash I noticed one of the push rods, (only one) was spinning! Well since it was running good I figured it was alright so I put the valve cover back on and went for a drive! After about 10 miles or so it gradually started running rough again, they were all adjusted correctly and none of them were clattering so how could this happen? Could the spinning push rod be the culprit and if so, why is it spinning?



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.