MCE Engines Quick Tip
Use a Torque Wrench
Why use a torque wrench? Because torquing fasteners to specification is all about bolt stretch and clamping force. Marvin stresses clean bolt threads with sufficient lubrication for smooth tightening. When you torque a fastener, it's a good idea to do it in third values. For example, cylinder head torque on a 289/302 is 65-72 ft. lb. total. First torquing should be 50 ft. lb., then, 60 ft. lb., then 65-72 ft. lb. Never over-torque. And if you do over-torque, replace the fastener and start over with a new one because you have permanently stretched the fastener and it no longer has proper clamping value.
When you torque a fastener, be smooth and steady. Never jerk a torque wrench to get the tell-tale breakaway "click." And never remove a fastener with a torque wrench. Always use a breaker bar or ratchet.