Hello everyone, I am looking to replace the engine on my airboat . I was wondering if anyone had any experience with a 4.3l v6 lv3 engine on an airboat? I am limited on space in my cage and was hoping to find a stand alone set up with this engine. Any advice would be greatly appreciated! Thank you
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4.3l LV3
- Thread starter Jeffh
- Start date
FISHSTICKER
Well-known member
Check with OXBOX. There is a guy they know that had one running really well.
John Fenner
Well-known member
Yes, 4.3, with the tbi intake, adapted to single barrel carb, will be sufficient.
Slidin Gator
Well-known member
The LV3 is not your father's 4.3, it a Gen 5, direct injected, aluminum block 4.3 motor based on the 5.3 missing 2 cylinders. It would make for an interesting project that could make good power, but it is not the same as the old school 4.3 or Vortec 4.3. Given everyone's experience with DD LS motors, I would not recommend it for a DD project. Go for it if you want to build a high pressure, fuel injected, geared setup.
But if you are wanting to stay lower tech (carbureted etc.), I suggest you look a few years back to a vortec 4.3. The TBI intake with single barrel adapter is a good direct drive setup. If you are gearing it look at Edelbrock for an aluminum 4 bbl intake, put a 500 CFM carb and turn to 5,500 with stock heads, 6,000 with aftermarket heads and cam.
If you go back to the 80's-90's you get to the original 4.3, first put in vans around 86. They made a few carbureted vans before everything became TBI. You can also get a cast iron marine intake for spread bore carbs.
Pro's on the Vortec is improved heads and roller tappets. Con on the Vortec is the cam driven counterbalance shaft under the intake, which you can and should eliminate. The mount bolt pattern for the Vortec intake is also more difficult to seal vs. the 90's 4.3. If rebuilding the motor you can also build a Frankenstein using Vortec heads on an older model block (did a V8 350 version one time).
This picture shows the Edelbrock aluminum intake on a Vortec 4.3 out of a 2006 GMC Sierra.
But if you are wanting to stay lower tech (carbureted etc.), I suggest you look a few years back to a vortec 4.3. The TBI intake with single barrel adapter is a good direct drive setup. If you are gearing it look at Edelbrock for an aluminum 4 bbl intake, put a 500 CFM carb and turn to 5,500 with stock heads, 6,000 with aftermarket heads and cam.
If you go back to the 80's-90's you get to the original 4.3, first put in vans around 86. They made a few carbureted vans before everything became TBI. You can also get a cast iron marine intake for spread bore carbs.
Pro's on the Vortec is improved heads and roller tappets. Con on the Vortec is the cam driven counterbalance shaft under the intake, which you can and should eliminate. The mount bolt pattern for the Vortec intake is also more difficult to seal vs. the 90's 4.3. If rebuilding the motor you can also build a Frankenstein using Vortec heads on an older model block (did a V8 350 version one time).
This picture shows the Edelbrock aluminum intake on a Vortec 4.3 out of a 2006 GMC Sierra.