4.3 to 5.7 TBI Swap Advice Needed!

Chevrolet Technology and Innovations
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Looking for Guidance on Engine Swap

I have a Chevrolet with a 4.3-liter engine, and I’m considering upgrading to a 5.7-liter TBI engine. I’m looking for advice or tips from anyone who’s done this swap or has knowledge about the process.

Questions I Have:

  1. Compatibility: What models are compatible with the 5.7 TBI engine? Are there particular years or specifications I need to be aware of?
  2. Parts: Which parts do I definitely need to swap out, and what parts can I keep from the 4.3 engine?
  3. Performance Gains: What kind of performance improvements can I realistically expect from this swap? Is it worth the effort?
  4. Troubleshooting: What common issues do people usually run into during an engine swap like this? I’d like to be prepared for any potential hiccups.
  5. Resources: Are there any good guides, videos, or forums that walk through the swap process in detail?

Additional Info:

I’m planning to do this as a DIY project, but I don’t want to run into unexpected problems. Any advice from your own experiences would be greatly appreciated! Thanks in advance for your help!

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I’m glad you’re taking on this swap! Just be aware that you’ll need a new wiring harness, as the 5.7 TBI has different connections than the 4.3. Make sure to double-check compatibility with your existing components.

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3

True, and don’t forget about the ECU requirements! The 5.7 needs a compatible ECU to handle the TBI system effectively.

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I’ve been researching this a lot lately. The engine mounts should fit, but it’s a good idea to confirm the dimensions before purchasing anything. No one wants a surprise at install time!

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Exactly! It’s better to measure than to guess. Has anyone found specific mounts that work without issues during their swaps?

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I’ve used aftermarket mounts on my 5.7 swap, and they worked perfectly. Just ensure that your transmission lines are also compatible with the new setup.

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Good point! What about exhaust? Will the current headers fit the 5.7 without issue?

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Exhaust can be tricky! Most 4.3 headers won’t work with the 5.7, so you may need a new exhaust system altogether. It can be a little pricey, but worth it for performance.

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Anyone else worried about the fuel system? The 5.7 requires more fuel pressure than the 4.3. Make sure to upgrade your pump and filter for optimal performance.

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Valid concern! You definitely don’t want to starve your engine for fuel after all this work.

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It’s quite the project! Just remember, patience is key. I’ve seen friends rush through swaps and end up with more issues than they started with.

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So true! I’ve spent countless hours on my last project. But hey, at least the process is half the fun, right? Nothing like some greasy hands and problem-solving! :joy:

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Haha, exactly! Each challenge really turns into a learning experience. But I’m still nervous about wiring!

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I suggest looking into a high-performance air intake system after your TBI swap. It can significantly improve airflow and efficiency, leading to horsepower gains.

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Definitely consider a new exhaust system too! It complements the intake and can enhance performance even more.

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Absolutely! A great tune can enhance engine responsiveness and drivability too.

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Have you thought about upgrading the fuel injectors? Higher-flow injectors could provide better performance after the swap.

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Just be sure to monitor your air-fuel ratio after any upgrades! Lean mixtures can cause engine damage.

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You know, sometimes I think the exhaust note is just as important as performance! A nice sound can really enhance the driving experience.

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Supporting mods are key—like upgrading the ignition system. It can improve spark efficiency for better performance.

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