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Old 04-18-2016, 10:11 PM   #1
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Default repowering 1900 with a ls

bought an old 1900sr needing engine repairs due to improper winter storage. block was cracked in two places. exhaust manifolds were also scrap. so......I had this great idea. being a 4.3 is only one number different than a 5.3, I'm repowering with some technology. not looking to make a race boat, just something that drives nice and reliable with enough power to pull the kids on a tube.
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Old 04-18-2016, 10:38 PM   #2
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Welcome aboard

Don't know anything about the 5.3 but if it was not offered in a marine package I would go with either a 5.0 or 5.7 which both will bolt in place of the 4.3 other than relocating the front engine mounts.

A none marine engine will not have spark protection on the starter and alternator. Fuel system designed for marine environment. Proper cam and timing curve. Also if used in salt water the head gaskets and freeze plugs will not last.

Is the 5.3 aluminum, block or heads? If salter water closed cooling is required.
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Old 04-18-2016, 11:53 PM   #3
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Quote:
Originally Posted by mmwjr View Post
Welcome aboard

Don't know anything about the 5.3 but if it was not offered in a marine package I would go with either a 5.0 or 5.7 which both will bolt in place of the 4.3 other than relocating the front engine mounts.

A none marine engine will not have spark protection on the starter and alternator. Fuel system designed for marine environment. Proper cam and timing curve. Also if used in salt water the head gaskets and freeze plugs will not last.

Is the 5.3 aluminum, block or heads? If salter water closed cooling is required.
There has been some versions of this family used in marine, so I can get a marine starter for it. I plan to make a bracket for a GM style marine alternator. Cooling will be a closed system, iron block and aluminum heads.
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Old 04-19-2016, 12:02 AM   #4
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changing valve spring for the camshaft swap
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Old 04-19-2016, 12:08 AM   #5
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empty hole, and stuff to fill it in.
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Old 04-19-2016, 01:52 AM   #6
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So what are you doing for the fuel system? Street injection system is not marine approved and requires a return fuel line to the gas tank, boat tanks are not equipped for this not Coast Guard approved. Merc and Volvo have customized systems.
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Old 04-19-2016, 02:19 AM   #7
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Did some reading and the marinized 6.0 components will fit the 5.3.

Neat project just not sure it's cost effective.
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Old 04-19-2016, 02:25 AM   #8
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I'm figuring provided I use quality hose and fittings, it shouldnt be too tough to make it as safe as or safer than the metered fuel leaker that came out. all too familiar with stuck floats, crap in the needle and seat etc. Haha
started on the fuel pump today.
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Old 04-19-2016, 02:45 AM   #9
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fitting pieces.
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Old 04-19-2016, 11:37 AM   #10
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Thanks for posting, I'll be following your progress.
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