72 340 balancer
Early '72s were forged crank and used the internal balance balancer.
Late '72s went to an externally balanced cast crank (and lower compression and smaller 1.88 vs 2.02 valves) and used the "cast crank 340 only" balancer.
The changeover came sometime during mid-year, so it depends on what crank you have.
Early '72s were forged crank and used the internal balance balancer.
Late '72s went to an externally balanced cast crank (and lower compression and smaller 1.88 vs 2.02 valves) and used the "cast crank 340 only" balancer.
The changeover came sometime during mid-year, so it depends on what crank you have.