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Looking for 400hp small block for cat

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Old 12-12-2011, 09:48 PM
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Is anybody offering LS engines. In auto world are cheap and durable. Have really hurt the small block.
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Old 12-12-2011, 10:08 PM
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Originally Posted by mike tkach View Post
wrong ,a pair of 400 hp anything will push a 30 ft cat not even close to 120
Sorry manufacturer said 400hp at prop pushes it 110, I misunderstood what they said. Thought that was pretty optimistic, but even with 496ho that is really good
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Old 12-12-2011, 10:37 PM
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Sorry manufacturer said 400hp at prop pushes it 110, I misunderstood what they said. Thought that was pretty optimistic, but even with 496ho that is really good
what brand of boat are you talking about?maybe i need to buy one.
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Old 12-12-2011, 10:53 PM
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what brand of boat are you talking about?maybe i need to buy one.
It ain't AO that's for sure!
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Old 12-12-2011, 11:06 PM
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It ain't AO that's for sure!
u got that right,my ao needs 950 to see 130,i want one of them cats that does 120 with 400 ps hp,then il put my engines in it and go 270
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Old 12-12-2011, 11:09 PM
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hay cat,does that hemi in your 300 have 400 hp
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Old 12-12-2011, 11:17 PM
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Sorry manufacturer said 400hp at prop pushes it 110, I misunderstood what they said. Thought that was pretty optimistic, but even with 496ho that is really good
I'd bet 400hp outboards would get that boat to 110!!!!!! YEEEHAAA.



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Old 12-12-2011, 11:28 PM
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400 Hp in a small block is easy to do. A GM crate ZZ383 makes 425 HP at 5400 and 460 ft/lbs of torque. My 355 built in 1995 with off the shelf Dart iron heads and a Crane,
http://www.cranecams.com/product/car...detail&p=24208, made 424 hp and 445 ft lbs. By the way if you compare the specs that Crane cam appears to be the same as the one in the GM ZZ383. If I were to do it myself I would start with a larger motor (420-430 ci) Some better flowing heads, and I would most likely use that camshaft again but pair it with some 1.6 rockers. I bet that would make close to or slightly over 500 hp over 500 ft/lbs, and still be able to idle through all of the no wake zones with ease (mine idles all day at roughly 600 rpms). Of course this is if I were to stay with a conventional small block. My first choice would be to go LSX, but that is another debate.
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Old 12-12-2011, 11:30 PM
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I'd bet 400hp outboards would get that boat to 110!!!!!! YEEEHAAA.



Darrell.
Pair of these?
http://www.seven-marine.com/
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Old 12-12-2011, 11:43 PM
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You can do it with an old fashioned 406 - but for that money it'll be a carb not efi.

My 406 makes 500 hp and 500 ft lb.

It takes good exhaust and careful selection of head intake manifold and carb to run and idle correctly for a stern drive app but you can build one like it for 8-9K if you go about it correctly and get lucky with a few parts.

With old school SBC's you can find good heads and reasonable priced rotating assemblies cheap, but youll end up paying for the exhaust whereas with the BB you can usually find used exhaust systems for sale. I went wih the classic West Coast choice of high end manifolds the Imco Powerflows.


In the end I spent about just as much as it would have cost to do a regular guy big block and wouldnt do it again, but at the same time must admit its roaring little beast in a 1900lb boat and really fun putting big blocks on the trailer.

Uncle Dave
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Last edited by Uncle Dave; 12-13-2011 at 08:22 PM.
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