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Chevrolet / Chevy Truck Engine >> REVISED HARMONIC BALANCER
Revised Harmonic Balancer On
GM 6.0 & 7.0L (366 & 427 CID) Truck Engines
The AERA Technical Committee has recently learned of a revised harmonic balancer for GM 6.0 & 7.0L truck engines. The new balancer incorporates a bonding agent on both sides of the rubber elastomer isolator. With that procedure the possibility of the inertia ring spinning or walking is greatly reduced.
The new balancer is also identified from previously made units by a B stamped at the end of the Date Build Code. This code appears on the face of the inertia ring (see chart below).
All previously built GM 6.0 & 7.0L engines may be updated with this new design balancer. Use Part #10106421 for 6.0L engines and Part #10106422 for 7.0L engines. General Motors began installing the revised balancer in late 1987 on the 6.0L engines (build code T1221) and early 1988 on 7.0L engines (build code T0301).
HARMONIC BALANCER DATE BUILD CODE
A 8 S B
(Month Built) (Year Built) (Company Vendor) Bonded
A = January
The AERA Technical Committee
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