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04-18-2016, 11:11 PM
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#1
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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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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04-18-2016, 11:38 PM
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#2
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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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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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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04-19-2016, 12:53 AM
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#3
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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Quote:
Originally Posted by mmwjr
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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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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04-19-2016, 01:02 AM
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#4
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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changing valve spring for the camshaft swap
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04-19-2016, 01:08 AM
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#5
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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empty hole, and stuff to fill it in.
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04-19-2016, 02:52 AM
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#6
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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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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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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04-19-2016, 03:19 AM
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#7
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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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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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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04-19-2016, 03:25 AM
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#8
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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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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04-19-2016, 03:45 AM
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#9
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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fitting pieces.
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04-19-2016, 12:37 PM
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#10
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Thanks for posting, I'll be following your progress. 
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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04-19-2016, 04:23 PM
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#11
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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truck oil pan clears with plenty of room to spare.
beginning of the forming of the exhaust risers
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04-19-2016, 07:00 PM
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#12
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Why are you making custom risers instead of buying them?
you will need a tube in a tube to cool them.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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04-19-2016, 07:20 PM
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#13
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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Quote:
Originally Posted by mmwjr
Why are you making custom risers instead of buying them?
you will need a tube in a tube to cool them.
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the outlet angle looks to be more difficult to work with. I'm trying to keep the alpha 1 prop exhaust rather than knocking holes through the hull/transom.
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04-19-2016, 10:37 PM
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#14
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Quote:
Originally Posted by Corfab
the outlet angle looks to be more difficult to work with. I'm trying to keep the alpha 1 prop exhaust rather than knocking holes through the hull/transom.
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Ok but you still need to water jacket the custom riser. On marine application all exhaust components are water jacketed as they are very hot and in confined space surrounded by flamable material.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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04-20-2016, 12:29 AM
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#15
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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they will be jacketed.
4" bends are on order.
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04-20-2016, 12:39 AM
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#16
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Quote:
Originally Posted by Corfab
they will be jacketed.
4" bends are on order.
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Cool. 
Love all your tools and ambition.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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04-27-2016, 07:55 PM
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#17
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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Quote:
Originally Posted by mmwjr
Cool.
Love all your tools and ambition. |
thanks. 
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04-27-2016, 08:00 PM
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#18
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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been a little tied up this week, but made some progress last night. fuel pump is now ready.
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04-27-2016, 11:23 PM
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#19
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,606
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Looks good but plastic components in the fuel line is a big Nono for the CG. That includes plastic inline fuel filters.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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04-27-2016, 11:41 PM
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#20
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Lieutenant
Join Date: Mar 2016
Location: racine wi
Posts: 58
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the only plastic about it is the flex hose from the pump to the fitting. It is EFI fuel line, designed for in tank use. I am using A/N style hose and fittings for the external connections. Not skimping on junk.
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Linear Mode
