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I have a 1999 4.3l Merc vortec with a 2b carb that needs a new intake manifold. This boat has had an engine runon problem since I've owned it. Premium gas and octane boost does not help. Also I need more power. Should I switch to a 4 barrel manifold and carb? Will this help my runon problem?
I need to purchase a 1999 4.3L v6 vortec long block. S# L350584. Rapido Marine is the cheapest I've found. Are they reputable? What info do I need to give them to make sure I get the correct block?
