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    1978 MCM 260 Vortec upgrade

    Hello, I have a 1978 Sea Ray srv240 weekender that has a worn out MCM 260 in it. I am planning to go with either a 400 or 383 SBC. I have many questions as this is my first time upgrading from old 1978 to newer equipment. The stock exhaust manifolds are the rear dump type. I found some center...
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    1968 Mercury 1250ss still runs ROUGH after new top end!

    I bought this engine and it never ran right. I tore it down and found that the lower main bearing and seal went out and leaned out #5 and #6. I replaced all pistons and rings honed and new upper and lower main bearings and seals. Its got good even compression on all cylinders. It still misses...
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    1968 Mercury 1250ss pistons

    I am trying to find 2 good used pistons to fit the motor mentioned above. Serial # 2397885. I have called all the salvage yards on the sticky in this forum, no luck. I have tried oldmercs.com and a new one without rings is $250.:eek: I am hoping someone in Iboat land has some they can part with...
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    1969 merc 1250ss vs 1984 merc 115

    My question is which one has more power at the prop? Will the 115 bolt in where the 125 was? (electrical, controls, trim etc.)
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    1971 Merc 800 to 1250 swap

    Re: 1971 Merc 800 to 1250 swap Got the 1250 ss bolted on today and it is truely plug and play!! Sprayed fuel in the carbs and it fired right up. I need to replace the water pump and a fuel line and tape some wires....Ill be on the water tomorrow afternoon!:D[ATTACH=CONFIG]100707
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    1971 Merc 800 to 1250 swap

    I have decided to swap from a 80 to a 125 both the same vintage. As far as I can tell it looks like everything should just bolt up. Is this really the case or are there things I should be aware of? How about the tilt and trim, just take off the lines at the pump and leave attatched to old motor...
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