GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Riviera 🢒 Engine 🢒 Engine Electrical 🢒 Spark Plug Usage

Spark Plug Usage L67

Application

Specification

Spark Plug

41-921

Spark Plug Gap

0.060 inch (152 mm)

Spark Plug Usage L47

Application

Specification

Spark Plug

41-950

Spark Plug Gap

0.050 inch (150 mm)