Question on 350

Automotive powered airboat discussion.
bandeddrake
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Question on 350

Postby bandeddrake » Sat Jan 13, 2018 9:52 pm

Can a 350 out of an 88 Chevy work for an airboat application, pushing say a 15 footer or so? What all should/could be done to it to beef it up.

Striker543
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Re: Question on 350

Postby Striker543 » Sat Jan 13, 2018 11:57 pm

It can, but it's not going to push a 15ft boat very well unless you add a gear reduction. There's a ton of ways to beef up a 350, but what you should do depends on what you're starting with (is it original from 1988?) and what gear ratio you go with.

That said, you could put a 350 on a 12 foot hull without a gearbox and have a decent economical boat if you keep it very light and don't need to take more than 1 other person with you.

bandeddrake
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Re: Question on 350

Postby bandeddrake » Sun Jan 14, 2018 12:01 am

I guess I'm just exploring different options at this point, which one is to start from scratch, find a 15 ft hull and build from there. A gear drive was the route I wanted to go.

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loudmouse
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Re: Question on 350

Postby loudmouse » Mon Jan 15, 2018 10:51 am

If ur set on a 15' hull then I would do a LS 6.0 with efi, gearbox and 3 blade NGR, R Or JX. A 350 gonna be underpowered on a 15' hull. Can it work YES but not ideal.
15' Alumitech deckover LSX TT Oxbox 84" JX 4-blade
Gas required Water optional :dontknow:
Built and Tuned by Me
14'X8' JW, Chevrolet 122CID LNF Turbo Engine, Ox box, 80" NGR 3 blade

Life is short, eat your dessert first! :downtown:

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Deano
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Re: Question on 350

Postby Deano » Mon Jan 15, 2018 11:25 am

loudmouse wrote:If ur set on a 15' hull then I would do a LS 6.0 with efi, gearbox and 3 blade NGR, R Or JX. A 350 gonna be underpowered on a 15' hull. Can it work YES but not ideal.

This is information you can take to the bank.
Don't kid yourself about what a semi-stock 350 can accomplish; the laws of physics will not yield to optimism.
Which is the bigger need? To use the 350 on hand, or to have a 15' hull?
As was said, a smaller hull could be serviceable. A 15' hull implies the need to tote a load.
A 350 may push a 15' hull OR it could tote a load; but very rarely would it do both with much grace.
Ultimately, it will be under powered just like LoudMouse conveyed earlier.
"The suppression of uncomfortable ideas may be common in religion and politics,
but it is not the path to knowledge; it has no place in the endeavor of science."
- Carl Sagan

bandeddrake
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Re: Question on 350

Postby bandeddrake » Mon Jan 15, 2018 3:49 pm

Thanks for the info guys. Either a 15 or 16' boat is what I'm wanting to have that I think will best fit my needs. I'm trying to do as much research as I can on this before my buddy and I dive in. He's a lot more mechanically inclined than i am and has rebuilt several motors before which is why i asked about this motor. What about a 383? Or what should I expect to pay for an LS motor from a place like Waterthunder

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SWAMPHUNTER45
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Re: Question on 350

Postby SWAMPHUNTER45 » Mon Jan 15, 2018 6:10 pm

How much money are you planning for your budget?

loudmouse
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Re: Question on 350

Postby loudmouse » Mon Jan 15, 2018 9:32 pm

I would call a salvage yard find a 2005-2011 6.0 around 100,000 miles change the cam and valve springs. Close her back up. Get a standalone wiring harness and someone lined up to tune her. If the engine is later than 2007 1/2 it will have the L92 heads and will make over 500hp easy. Be very reliable and run like a 2017 truck. That will push ur 15ft boat pretty darn good. Or if you have a good amount in ur budget GM sells the LS complete for about $5000. Also the LS will be good on fuel where a sbc or bbc will be thirsty.
15' Alumitech deckover LSX TT Oxbox 84" JX 4-blade
Gas required Water optional :dontknow:
Built and Tuned by Me
14'X8' JW, Chevrolet 122CID LNF Turbo Engine, Ox box, 80" NGR 3 blade

Life is short, eat your dessert first! :downtown:

bandeddrake
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Re: Question on 350

Postby bandeddrake » Mon Jan 15, 2018 9:41 pm

SWAMPHUNTER45 wrote:How much money are you planning for your budget?

I would say around 7-9k if that seems realistic

SWAMPHUNTER45
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Re: Question on 350

Postby SWAMPHUNTER45 » Mon Jan 15, 2018 10:28 pm

You may want to look for a used boat rather than take on a build.

diamondback0320
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Re: Question on 350

Postby diamondback0320 » Mon Jan 15, 2018 10:49 pm

X2

bandeddrake
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Re: Question on 350

Postby bandeddrake » Mon Jan 15, 2018 10:55 pm

SWAMPHUNTER45 wrote:You may want to look for a used boat rather than take on a build.

Yeah I've been looking around, I like a good project though.

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Jason Finser
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Re: Question on 350

Postby Jason Finser » Tue Jan 16, 2018 1:19 am

If you cut corners trying to keep within budget, you won't end up with what you want and you'll spend more money in the long run trying to get it right by upgrading everything piece by piece. Been there, done that. I had a $10k budget and wound up spending $30k before I had it where I wanted it. Then went a completely different direction and spent another $20k+ and now I am rocking a bad ass Airboat, but I learned a few more things along the way, and now I am wanting to have a brand new one built.

I started with a SBC 350. Then had it beefed up.
Then went to a BBC 454. Then had it beefed up.
The 454 was a beast and did great for a long time. Then I had to go bigger. I had a pro built 502 built by Muscle Machine Race shop in Eustis.
I started with a fiberglass hull because it was cheaper. I now prefer an aluminum hull.

Current Airboat 18X8 aluminum GTO Hull with walk boards and nonskid. Flat deck added for handicap accessability. Seats 6 plus the captain. Runs dry fully loaded, climbs hills and does everything an Airboat should.

Powered by a freshly built 502 Dyno tested at 650 HP and 600 TQ turning an OxBox 2.55-1 gear ratio spinning a 4 blade 83" EX Whirlwind prop

Wanting to upgrade to the 632 BBC with 800+ HP and 900+ TQ

Don't be like me. Never enough power.

Just go to a reputable builder. Tell them what you want to do with the Airboat, and have them build it to do what you want it to do. It will save you money in the long run.


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