aftermarket HEI coils
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
I have the Accel coil and cap and they do fit tight, I used a dremel tool to grind away the back of the cap on an angle so it wouldn't hit the hood.This coil and cover were on the car when I got it, I wouldn't have purchased this setup myself..If your getting the new cap and coil just for more spark, its not necessary until your into at least the 375-400 hp range. The stock coil will handle most cars out there..WW
Last edited by WW7; Jun 27, 2010 at 09:29 AM.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
The stock coil puts out plenty of spark, you don't need an aftermarket coil. Besides, for the same size coil you cannot get more spark energy, but the aftermarket guys can get more of your money! 
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
actually, it is possible to play with wire size and number of turns of wire to get higher coil output in the same size package as oem...most such endeavors result in reduced coil longevity, however (i have in fact sent three of 'most popular brand' aftermkt HEI coils to recycling as they were non-fuctional, only one oem HEI coil dead EVER)
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Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
JACOBS Electronics makes and sells an entire line of high-end ignition products for our engines. The owner, who has a PhD on the subject, published a book on the automotive ignition system. Naturally I had to buy it to see what's what. (Where it now is anyone's guess, LOL.)
In it he explains what works, what doesn't and why. He even wrote about the plug wire resistance game the wire companies play. You know, "My plug wires have less resistance than yours so mine are better". Eye candy!
He went on to write that the GM coils are right at the top of the list of the best coils you can buy, even compared to his - Now That's Saying Something When You Think About It.
He even listed the specific GM part numbers of the coils he's tested and on which he based his conclusions. Of course, I can't recall the actual #s, but they may be listed on the Jacob's site.
Just passing this along for what it's worth. Hope it helps.
Jake
Burning Brakes
Joined: Feb 2010
Posts: 1,013
Likes: 2
From: California City Ca
I had one on my old Trans AM many years ago.
But what I can remember I did not notice and change the car was stock 1982 Recaro TA with the little 305 pushing around
I though it was a waste of money at the time.
But what I can remember I did not notice and change the car was stock 1982 Recaro TA with the little 305 pushing around
I though it was a waste of money at the time.
Burning Brakes
Joined: May 2010
Posts: 900
Likes: 3
From: Cary illinois
I have the DUI coil in my very stock 86 l98. I saw no change from the stock one . I also have the dui module from a previous hei motor . The wiring on the corvette module is differant , couldnt use it
Tech Contributor
Joined: Jun 2004
Posts: 20,932
Likes: 962
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
I've been running the stock Delco system in my '84 turbo 355 for years. There's enough oomph in the stock system for most reasonable applications.
