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Anybody ever use an LS3 engine in marine application?

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Old 10-02-2017, 07:58 AM
  #21
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when I talk about marinizing, talking about, water pump setup, exhaust, etc that stuff is pricey for LS at this point
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Old 10-02-2017, 10:33 PM
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Originally Posted by ezstriper View Post
when I talk about marinizing, talking about, water pump setup, exhaust, etc that stuff is pricey for LS at this point
This spring a local guy was hounding me to install a ls3 in his boat, couldnt find a source for stock cooling system parts that came on some boats, manifolds , heat exchanger, motor mounts, pulleys/cooling pump appeared to be around 7000$ from hardinl. labor to retrofit it all, running engine, etc and it was north of 10,000 no mwtter how you dice it
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Old 10-03-2017, 12:18 AM
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My numbers are higher.
I expect just few cents less than 11.000 euros with taxes, except my and brothers work, but this is our hobby. Tell me for cheaper engine with 480 hp? No go to buy new marine engine with 400 + hp there in EU for less than 15.000 euro inclusive taxes. GM claim 495 hp with classic headers for LS367-480 engine and with marine headers like Kodiak or Marinepower, will gain another few hp. I know, at the end will go down for 5-10 hp becouse of more fuell pressure-seccurity for pistons, but at the end will be at least 460-470 hp at 5800 rpm on prop. This engines have probably better mileage than bbc (Better compression, 300# less weight...) and this 11.000 euro is not so much if is all this true.
By light pad kell boat, 27 ft long, or 29 LOA, with less than 4400# ready to ride it is 475 lb-ft probably enough for happy ride. And this torque is almost same betwen 4.300 and 5.000 rpm. with MSA surface drive, ZF 1,56 and labbed Maximus 26" I expect maximum speed arround 80 mph and best mileage close to 50 mph.

Is it unreall?
Is it expencive?


p.s.
Last days I hear a lot about diferent clearences, diferent gaskets... betwen street and marine engines. I understand if use direct cooling, but is this true with closse cooling and if you have in your mind heating time before full power?
What lambda numbers need to keep to avoid pistons burning?

Last edited by plavutka; 10-03-2017 at 12:23 AM.
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Old 10-03-2017, 07:47 AM
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my point exactly...great engines, have 2 race cars running them...will be great marine engines when more people do the marine parts
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Old 10-04-2017, 02:13 PM
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Yes I have 2 6.0 LQ9 s in a 30 ft cat 400 hp each out of 2005 Cadillac Escalades Was a big project.Used all components from donor vehicle.Sent computers out to get Vats removed.Stripped wire harness of un nessasary wires.Found Exhaust manifold from a friend (PCM Marine)
Engines require closed cooling. But they run great. Easy on fuel 2 of these burn the same as 1 BBC Took about a year to put them all together.
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