5.3 ls build questions

Automotive powered airboat discussion.
Post Reply
porker
Southern Airboat Member
Posts: 37
Joined: Sat Jul 17, 2010 11:02 pm

5.3 ls build questions

Post by porker »

Thinking of buying a 5.3 ls motor and going car motor just not happy with aircraft. What gearbox ratio do u guys think I should run and prop for best push and what do I need to do to get fuel injection ready to go on airboat. Also I have a 12.6x7.4 Alumitech hull to put it on do u think it would push good.

porker
Southern Airboat Member
Posts: 37
Joined: Sat Jul 17, 2010 11:02 pm

Re: 5.3 ls build questions

Post by porker »

I have a 0-470r its 230hp. I am gunna replace prop with a 2 blade to see the difference. I was thinking a aluminum blockand head motor. I just don't like getting hung up

User avatar
Waterthunder
Site Supporter - VIII
Site Supporter - VIII
Posts: 8166
Joined: Fri Jan 21, 2005 3:16 pm
Location: Melbourne
Contact:

Re: 5.3 ls build questions

Post by Waterthunder »

A 5.3 is only 327 cubic inches. If any motor needs a gearbox it's a small 327. I would suggest a 2.68 ratio. Also them 5.3 are very lazy unless you run a EFI I built a few of them with a carb as a budget motor but every person that got one was disappointing because they expected it to rev like a 6.2L that little motor with a carb is only good because they are cheap. As for performance its the worse combo I have seen in the LS platform.
THE PROOF IS IN THE PROP!

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

http://waterthunder.com/
321-508-5316

porker
Southern Airboat Member
Posts: 37
Joined: Sat Jul 17, 2010 11:02 pm

Re: 5.3 ls build questions

Post by porker »

12.6 x7.6 Alumitech and I would wanna run fuel injection

CarMotorBarge
Site Supporter - I
Site Supporter - I
Posts: 960
Joined: Thu Jul 14, 2011 8:32 pm
Location: Lake Harney Woods

Re: 5.3 ls build questions

Post by CarMotorBarge »

How much are you looking to spend? Getting an all aluminum 5.3 isn't exactly cheap and they are hard to find.
14x7.5 Al David hull with 14 inch transom
419 CI Horsepower Barn LS3 with 2.88 Ox Box swinging 4 blade 83.5" R
GTO Rigging and B&S Tilt Trailer

lorick
Southern Airboat Member
Posts: 152
Joined: Wed Apr 28, 2010 10:42 pm

Re: 5.3 ls build questions

Post by lorick »

JR this is Everett met you down in mims last summer came down with SHANNON. your boat ran awesome so I had Al David build me a 13x7 deck over put my wore out 540 on it will go anywhere fun to drive I love it. hope to see ya out there soon. Rick :thumbleft:

CarMotorBarge
Site Supporter - I
Site Supporter - I
Posts: 960
Joined: Thu Jul 14, 2011 8:32 pm
Location: Lake Harney Woods

Re: 5.3 ls build questions

Post by CarMotorBarge »

Cool. Al builds a really good boat. We need to ride again.
14x7.5 Al David hull with 14 inch transom
419 CI Horsepower Barn LS3 with 2.88 Ox Box swinging 4 blade 83.5" R
GTO Rigging and B&S Tilt Trailer

lorick
Southern Airboat Member
Posts: 152
Joined: Wed Apr 28, 2010 10:42 pm

Re: 5.3 ls build questions

Post by lorick »

SHANNON has his motor apart but should be back in a couple of weeks. will be in touch. sorry we got off the subject

User avatar
chevy01
Site Supporter - II
Site Supporter - II
Posts: 236
Joined: Sun Feb 08, 2009 5:07 pm
Location: orlando fl,

Re: 5.3 ls build questions

Post by chevy01 »

i have a 12x8 aluminum hull with a 6.0l lq4 268 oxbox 77" R series. i modified my own harness from a tuck harness and have not had any problems yet goes any wear i point it
11'6 bigbad custom lycoming 0340 straight valve

User avatar
chevy01
Site Supporter - II
Site Supporter - II
Posts: 236
Joined: Sun Feb 08, 2009 5:07 pm
Location: orlando fl,

Re: 5.3 ls build questions

Post by chevy01 »

Image


Sent from my iPhone using Tapatalk
11'6 bigbad custom lycoming 0340 straight valve

Chaseh
Southern Airboat Member
Posts: 405
Joined: Sat Mar 09, 2013 1:31 pm

Re: 5.3 ls build questions

Post by Chaseh »

chevy01 wrote:Image


Sent from my iPhone using Tapatalk
I bet that thing is a f-ing rocket!!!

Neversatisfied
Southern Airboat Member
Posts: 16
Joined: Fri Jan 02, 2015 8:05 am

Re: 5.3 ls build questions

Post by Neversatisfied »

I am running a 12'6 x 7 Diamondback ultra-lite with an aluminum 5.3 and a 2.38 ballistic with 80" Whispertip EX. I am running a AED 750HO carb with an MSD box.

My boat runs anywhere I point it. Cooler, full tank, single and a double.

Put in a nice cam, good double valve springs, hardened push rods. You will have a nice 400hp aluminum motor that is great on fuel!


PM me if you wanna talk anymore about it.

DIBBS7J
Southern Airboat Member
Posts: 64
Joined: Sat Jun 09, 2012 11:11 pm
Location: palatka,fl

Re: 5.3 ls build questions

Post by DIBBS7J »

I'm running a stock 5.3 with Efi, 2.37 rotator and a 2-blade 82" R on a 14x8 glass hull and I'm very very pleased with it!!
14x8
5.3 Efi Rotator 2.37 82" sensenich 2-blade R

It is what it is

RYPiii
Southern Airboat Member
Posts: 69
Joined: Mon Sep 08, 2008 6:00 pm

Re: 5.3 ls build questions

Post by RYPiii »

For those running 327's... what is a good cruising RPM and @ what speed?

Post Reply

Return to “Automotive Power Only”