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#1
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Be sure to change both of your manifolds, not just the one that is leaking right now. It's pretty much straight forward on swapping your FWC componets over to the new engine. What would be ideal is to have a heat exchanger big enough to cool the manifolds as well, that way you would only be concerned with replaceing the risers when they start to eat away which in the long run would be cheaper. On my Seavette, every thing is FWC for the exception of the risers in which those are made of stainless steel.
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Steve B 1978 23ft SeaCraft Seavette 502HP ZZ502 Mercruiser TRS Drive-Sold-UGH! 1998 28ft Carolina Classic 7.4 Volvo Penta Duo Prop |
#2
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Steve is right. Stainless is the way to go, if you can. But don't assume that stainless is a panacea.
I have even seen one of those fail from what was apparently electrolysis damage. It was on a Formula 302 with twin Merc 7.4L 440 hp with the "Silent Thunder" stainless exhaust manifold/riser/muffler systems. The stainless exhaust manifold had what looked like a wormhole going from the water jacket out to the outside of the manifold, spraying a fine mist of saltwater over everything. When we tore it down, the inside had several more of those wormhole-looking defects, but none that made it to the outside (or to the interior, either).
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes. Fr. Frank says: Jesus liked fishing, too. He even walked on water to get to the boat! Currently without a SeaCraft ![]() (2) Pompano 12' fishing kayaks '73 Cobia 18' prototype "Casting Skiff", 70hp Mercury |
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