The plastic pointer is GM part number 527065.
These were only used on the low performance 350 and 400's 1976-1978.
The W72 used the traditional balancer with corresponding cast cover as shown by BWB...
__________________
1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
|