vivivivivibration
OK this is all really good stuff here. The orange early 318 style front vibration dampener is correct for your 71 340 Steel Crank application. Would not worry about the helicoil in the flywheel as the helicoil pretty much replaces the old thread material.
Let's go on to the Flywheel. Good Pictures, looks like you have the "Single Drilled Hole" 340 external balance cast crank Flywheel in your car now. They Drill the Single Hole to remove weight to work with the later 72/73 340 external balance cast crank applications. See attached picture of the diagram of the 340 external balance cast crank flywheel. Figure 5 - 21, this is the wrong flywheel for you.
A Standard 318 internal balanced steel crank style Flywheel should take care of your vibration issue. Think they call that neutral balance non-drilled flywheel.
Same neutral balance flywheel the steel crank internal balance early 340s will take.
OK this is all really good stuff here. The orange early 318 style front vibration dampener is correct for your 71 340 Steel Crank application. Would not worry about the helicoil in the flywheel as the helicoil pretty much replaces the old thread material.
Let's go on to the Flywheel. Good Pictures, looks like you have the "Single Drilled Hole" 340 external balance cast crank Flywheel in your car now. They Drill the Single Hole to remove weight to work with the later 72/73 340 external balance cast crank applications. See attached picture of the diagram of the 340 external balance cast crank flywheel. Figure 5 - 21, this is the wrong flywheel for you.
A Standard 318 internal balanced steel crank style Flywheel should take care of your vibration issue. Think they call that neutral balance non-drilled flywheel.
Same neutral balance flywheel the steel crank internal balance early 340s will take.
