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Old 04-20-2013, 09:03 PM   #21
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Originally Posted by Mike1995 View Post
I called the junkyard this morning and ordered a 5.7 from a 1997 Tahoe. I should be picking it up Tuesday morning. $350.
Someone has the itch to start a project. Will be nice to track your progress.
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Old 04-20-2013, 09:23 PM   #22
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Yea, that itch has been bugging me for quite awhile. Let'* just hope I can actually start it. Unlike the last itch that'* sitting down in the basement(Ported/Polished supercharger for the Bonneville). Friggin 6n1 work schedule.
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Old 04-21-2013, 08:57 AM   #23
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the 5.7 has to have 65psi and the new delphi mpfi just to run right, i would have just started with a 5.3. whats the pressure of the 4.3, is the pump the same?
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Old 04-21-2013, 06:04 PM   #24
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Everywhere I have read, the stock 4.3 fuel pump will feed a 5.7 or 5.3 just fine. I think I even seen one post somewhere that the injectors themselves are the same size, but just 2 more of them.

Oh, I don't even want to think of a 5.3 swap. I seen they are more difficult than the bigger 5.7.
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Old 04-21-2013, 06:43 PM   #25
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it may be slightly more difficult at first, the only problem i can think of is adapting the metal line to the one like the 5.3 has but im sure they make adapters. possibly have to get a pcm and harness. but the 5.7 will need some figuring as well. but you start with a base with 50 more hp and the lsx family is way more responsive to mods, where the 5.7 has a flaky fuel system that limits just about anything. unless you spend a ton to put aftermarket stuff from the manifold up.
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Old 04-21-2013, 06:46 PM   #26
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No, my existing 0411 pcm can handle 4.3, 5.0, 5.3, 5.7, 6.0 etc.

And the existing 4.3 harness needs 2 more wires for the extra injectors, coolant temp sensor extended and I think something with the knock sensors. More research needed.
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Old 04-21-2013, 06:49 PM   #27
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is the engine mount in the same location?
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Old 04-21-2013, 06:53 PM   #28
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The mounts will work, but a different bracket will be needed to accommodate the mounting holes so the engine will sit more forward/center. Otherwise the distributor will hit the firewall. Unless I take a 20lb sledge and relocate the firewall, LOL.
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Old 04-21-2013, 06:55 PM   #29
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its called a fine body adjustment tool
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Old 04-21-2013, 06:58 PM   #30
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Lmao!!!
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