Matt69olds
Full Access Member
- Joined
- Jan 8, 2018
- Posts
- 2,485
- Reaction score
- 3,892
- Location
- Central Indiana
- First Name
- Matt
- Truck Year
- 81
- Truck Model
- GMC 1/2 ton
- Engine Size
- 455 Olds
When HEI first came out, the modules did have some reliability issues. It didn’t take long for Delco to figure it out and solve the issue. Unfortunately, the bad reputation still lingers.I've heard a lot about module failures over the years and guys carrying spares. But I've installed several HEIs in 50s-70s project vehicles starting in mid-1990s, and none of those ever had a module, pickup, or coil failure. Some had stock internals, others were upgraded to MSD module, coil, rotor, and cap back when those kits were made in the USA and reasonably priced. Also put a Proform HEI in my 82 C10 in 2015.
I also had stock GM HEIs in four 74-81 Chevy and Buick daily drivers that I can think of. None of them ever failed. However, your comments and others make me want to carry a spare module. Just need to find one that isn't Chinese junk. What do you all recommend?
Even counting the time working in a dealership service department , I bet I have only replaced a dozen ignition modules over the years. I have never personally had one fail in one of my vehicles, however I did have a friend who’s car would die after it got hot.
If someone is having repeated module failure, either they are using junk parts, or the aren’t using the correct THERMAL heat transfer paste. Don’t use dielectric grease!!