Craigslist sanity check: 4L80e + 5.7L SBC 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**gigamanx** · 07-14-2017, 02:46 PM

Piecing together parts, but I may have missed something. I have a battery, starter, ignition switch, and the GM HEI that came from the TBI engine. Is there something that is supposed to be between the HEI and the starter? Trying to test the engine with the least amount of wiring and accessories necessary. I found a few diagrams, but they all talk about having a relay or coil except for this one:

**joedoh** · 07-14-2017, 10:01 PM

Quote:

Originally Posted by gigamanx

the GM HEI that came from the TBI engine.

TBI doesnt use HEI, and neither does the CFI that is on your new engine. HEI is a "coil in cap" ignition that was on engines prior to TBI. A TBI distributor will have a hall effect switch and a separate coil, and the CFI will just have an angle sensor for the PCM.

if you want an HEI, you will need to buy one.

07-14-2017, 02:46 PM	#1
gigamanx Senior Member Join Date: Sep 2016 Location: Hershey, PA Posts: 1,005	Re: Craigslist sanity check: 4L80e + 5.7L SBC 350 Piecing together parts, but I may have missed something. I have a battery, starter, ignition switch, and the GM HEI that came from the TBI engine. Is there something that is supposed to be between the HEI and the starter? Trying to test the engine with the least amount of wiring and accessories necessary. I found a few diagrams, but they all talk about having a relay or coil except for this one: __________________ Current Build Thread 1930 Ford Model A Modern Twist: Ford Model A Rat Rod With a Modern Twist Build Thread Phase 1 "The Swap": 1949 3100 with S10 swap. Beginner build with ambition! Build Thread Phase 2 "The Drop": Beginner Build with Ambition gets Air Ride



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