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Old 08-14-2016, 10:39 PM
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HEI ignition purchasing help

My parts guy doesn't know what to order for my 4.2 to upgrade the ignition to HEI. I'm assuming it's because when he looks up the engine info, there are no part numbers associated for it. What can I do to help him out here? This guy gets me unbelievable prices on parts so I want to stick with him. Just need to help him out

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Old 08-15-2016, 07:45 AM   #2
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I got mine from CRT. They list the engine type with each model of distributor, so it's very easy to order the right one. Other than the 8mm wires and possibly a length of 10-12 ga ignition wire, there's really nothing else you need.

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Old 08-15-2016, 10:37 AM
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Thank you dsaylor
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Old 08-15-2016, 03:55 PM   #4
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I got my HEI from Summit Racing. The salesperson stated that the gear that engages the cam is the correct one for the application and won't damage the cam.

You will also need a relay between the battery and the distributor that is activated by the 12V. wire from the start and run positions at the ignition switch. I got my relay at NAPA but almost any auto parts store will have a A/C relay. The relay is also the same part number (separate relay) that I use for my high powered driving lamps.

Loyalty to a salesperson is uncommon. He must be a great guy.
I prefer to buy online from Morris 4X4 because of the Christian statement on their invoice.
That said, Sometimes it's just better to buy direct from the source.

Good Luck, L.M.
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1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 08-15-2016, 06:18 PM   #5
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Quote:
Originally Posted by Luckymac View Post
I got my HEI from Summit Racing. The salesperson stated that the gear that engages the cam is the correct one for the application and won't damage the cam. You will also need a relay between the battery and the distributor that is activated by the 12V. wire from the start and run positions at the ignition switch. I got my relay at NAPA but almost any auto parts store will have a A/C relay. The relay is also the same part number (separate relay) that I use for my high powered driving lamps. Loyalty to a salesperson is uncommon. He must be a great guy. I prefer to buy online from Morris 4X4 because of the Christian statement on their invoice. That said, Sometimes it's just better to buy direct from the source. Good Luck, L.M.
I've wondered about the relay. Mine is direct wired from the switch. Is there a benefit to using a relay from the battery?
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Some stainless
Making new, one piece at a time
Other car is a Prius. 😂
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Old 08-15-2016, 07:08 PM   #6
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According to posts on this forum, the current required to get full benefit from the HEI coil exceeds what is available through the switch.

I am in the process of installing my HEI along with some other related upgrades.
I am running 12G. wire from the battery to the relay and then on to the distributor. I will activate the relay with the wire from the switch. Even though I probably don't need the full benefit from the HEI due to the moderate use of my Jeep, I am running the relay to save any possible damage to the switch and related wiring.

Good Luck, L.M.

__________________
"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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