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I had a muffler blow up (literally) on my 340 EC and can't find a replacement anywhere....anyone know where there might be one???

I need to repower my 1988 340, 454s, straight inboards, does anyone have any advice or what best to use? I can't afford new so I was looking at remanufactured long blocks. I would like to up the hp as long as I will be going thru all this trouble. Any advice, experience or leads will be...

I have a 1988 340 express with a Marine Power 454 (2000). The engine starts and sounds good, however, after 20 minutes or so it dies, regardless of the RPMS. It will restart but then dies after only a couplee of minutes. There is no water in the seperators, The fuel pump is new, the filter at...