Looking to order new riser gaskets for my 1987 mercruiser 4.3 V6. With no expansion piece on the riser. The question is what is the difference between the restricted flow gasket and the full flow gasket? Does it matter which one I use? I would assume the full flow one is better as it allows more water through the manifold. No idea what the original part number was or where to find the part number for an OEM look up. Any and all hep it appreciated.
