This Package includes a Stainless Steel plate and two Riser Gaskets used on "Barr style" center riser manifolds.
The Block off Plate is sandwiched between the two riser gaskets to separate and block the coolant in the manifold from from going out of the riser on fresh water (closed system) cooled applications.ONLY USED WHEN YOU HAVE ANTI-FREEZE IN THE EXHAUST MANIFOLD
Bolt pattern Dimensions: 4-1/16 x 2-5/8
Fits: Barr Generic Center Rise Exhaust Manifolds.
CHV-1-83 SB GM
FM-1-83 SB Ford
CHVA-1-84 Big Block Chevy.