This Accufab Plenum is specifically designed as a direct bolt on for use on the 1986-1987 Buick Grand National 3.8L V
*Notice Accufab updated this part in Early 2026, it is now CNC machined from solid billet aluminum instead of the old cast aluminum in the past.
What's In The Box?
CNC Ported Polished Plenum
Plenum Manifold Gasket
Metric and Standard Bolts
Throttle Body O-Ring
