Exhaust Riser Spacer Block Kit 6 Inch used on Mercruiser Center riser Manifolds 1983-2002 V6 V8 Applications.

Used to raise the height of the exhaust riser to maintain a downward exhaust slope.

(GLM51240 and GLM51230) from 1983-present on V-6 & V-8 applications.

The kit comes complete with all hardware and gaskets.

Dry Joint 6" Riser Spacer Kit
Application for dry joint exhaust manifolds.
Replaces Mercruiser: 864908A1
How to determine if you have Dry-Joint Exhaust

Spacer Kits have a $6.00 shipping and handling fee per each kit