correct gaskets

[bumhead]

OK,any one know the correct gaskets for gen iv 454 merc Fwc.I need the gasket between the riser and the manifold.4 slot 2slot or blocked?They are GLM center riser.

 

[rfdlou]

The gaskets should be an exact match with the number of slots in the riser & manifold. If full fresh water cooled, meaning the manifolds have antifreeze in them. You must use a blanking plate with a gasket between the riser & the plate & between the plate & the manifold.