Overview Product Description Product Videos Custom Field Year 1991 Make Buick Model Riviera Engine 3.8L Engine Parts Engine Block Components Product Reviews Write a Review Write a Review × Engine Parts Piston Set - 1991 Buick Riviera 3.8L (P1581(6).I81) Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments