4.3L to ?? swap.

[Jeepwalker]

Check plugs too. I've had new plugs go bad believe it or not. In fact, if you have the plugs out, you might do a compression test. It won't hardly cost you any extra time and possibly rule out a valve/lifter/rocker problem. It's always possible a push rod slipped off.

 

[fancyTBI]

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[Jasongriff]

New to this forum. Looking fo some answers about my project.

It is a 95 c1500 w/4.3l vortec, manual trans. I have purchased a 5.7l equipped with a FITECH efi. I have questions about wiring harness and eprom's. Do I need to swap out the harness, change te eprom.

 

[Jasongriff]

Sorry I left out that it will be running a msd ignition.

 

[Schurkey]

Sorry I left out that it will be running a msd ignition.

WHICH "msd ignition" and WHY? Wasted time, money, effort, and enthusiasm. Some of it is high-failure junk causing more problems than it's worth.

This coming from a guy with a small Stonehenge of red spark-boxes in his shop, an ancient MSD counter display, and who ran an MSD 6T in his '88 K1500 until it died.

 

[1998_K1500_Sub]

@Jasongriff, I suggest you start a new thread for this topic.

Title it something like "1995 4.3L swap to FITECH-equipped 5.7: Need wiring, tuning help" or something of that nature.