383,350 or ls2 crate motor

Automotive powered airboat discussion.
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what motor should I run

350 chevy
383 chevy
ls2 chevy
Total votes: 32

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383,350 or ls2 crate motor

Post by mudkat » Wed Jun 27, 2007 11:10 pm

I'm getting parts together for a new airboat (2.68 gear drive,wide 3 blade prop)and trying to decide on a motor.
how much torque do you gain on average with a 383 over a stock 350 ci ,all things being the same between them.
I'm really thinking about getting that ls2 440 hp chevy crate motor but I could save some money building a sbc.
What do you guys think is the better choice.

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Post by crowhater » Wed Jun 27, 2007 11:48 pm

This is a no brainer, you need a Caddy. :D
18x8 Alum, 496 BBC, 2.6 CH4, 4B 82" S-blades


Post by FELBER632 » Thu Jun 28, 2007 12:12 am

If it's about budget, the 383 is the wisest choice power per dollar. It cost hardly more than the 350 and makes a WAY better torque curve. But a LS1 (vs new LS2) should be considered. Still a decent amount more money than the 383 but over 150#s lighter, and if you can find the money for it, you'll never be happier.. JMO


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Post by T-REX » Thu Jun 28, 2007 12:26 am

mike, is there any benifit to anything in the LS line up, as far as a airboat motor goes?
strengths or weaknesses that maybe should be considered.........??????? the ls1 vs the ls2 in simpler terms.....


Post by FELBER632 » Thu Jun 28, 2007 12:49 am

Tom, No there isn't any performance avantage, just cost. Anything you're gonna use in the LS2 platform is basically gonna be all new and the cost goes along with it. But a used LS1 can be obtained or built by someone else such as Dave, myself or another good engine builder for some money savings. When Dave and I first put serious thought into the engine years ago, we knew it's potential. Dave has put a lot of R+D into perfecting it as a package for airboats, whereas the majority of my experience has been strictly HP based/Car related. The LS2 has more displacement at the same weight and actually comes with an even better cylinder head than the LS1 (It's a LS6/ZO6 "243" casting). Even the "lowly" LS1 head is superior to the majority of aftermarket Small Block Chevy heads, and the overall package tends to make more broad, as well as peak power at a weight that is insanely low.


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Post by Waterthunder » Thu Jun 28, 2007 8:18 am

The Gen III (LS1,LS2,LS6) is a way better motor then the old SBC. There are several reasons why weight, durability, rocker arm ratios, the cylinder heads are superior, cam base circle, ignition, torque curve and fuel effecency. Remember the old SBC was designed around 1953-54 I think G.M. has learned a thing or two in 45 years. You can make a LS2 ride like a light A/C boat with twice the power. I always like the way a properly built aircraft boat rode but always liked the power of a car motor with the GEN III LS motor you can have both. I use to laugh when after racing some A/C guy's with my 14' deckover they said my boat was lighter so I had an advantage!

"If you copy someone you will only achieve what has already been done."


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Post by Sniper » Thu Jun 28, 2007 11:38 am

Run the LS motor you cant go wrong there lighter more reliable put out more power and the never get hot and they burn less gas because they are more efficient
Sniper You can run but why die tired, If you heard my shot you were not the target
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Post by John C » Thu Jun 28, 2007 1:24 pm

I like a little bigger boat than most guys, and I am a Caddy fan. But if I were to put a boat together that was less than 15ft I would just have Dave build me one and be done with it. I don't think you Can beat the price for the package. I have only heard very positive feedback on Waterthunder power, and word of mouth means alot. One thing that I have learned the hard way is you get what you pay for. If I were going to spend money on a new motor It would be on one that was specifically built for an airboat.

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