Hello,
The Volvo repair manuals doesn't mention it, but just about every 6 bolt flywheel I've ever serviced had a step and I've been doing this for over 40 years.
The early B18 flywheels didn't come with pins.
Also, early B18 flywheels need to have a recess cut into the inner edge of the flywheel surface to accommodate the updated F&S clutch disc. .
You can see the recess in the picture below.
http://hiperformanceautoservice.com/images/6BoltFlywheelStock.jpg
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502 hiperformanceautoservice.com or oldvolvosonly.com
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