Looking for HEI Suggestions

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Michael Bennett

Greasemonkey
Jun 7, 2018
121
41
28
Hey guys, I've read a bunch of HEI threads but I'm looking for some suggestions on what you guys have actually used. 400 small block pushing around 400-450HP.
I'm currently running the Summit branded https://www.summitracing.com/parts/sum-850001r but running into some higher rpm misfire issues so figure it's time to up grade.

These are the HEI's I'm looking at:

 

565bbchevy

Geezer
Aug 8, 2011
9,581
12,589
113
Michigan
Keep the distributor and upgrade the module first and then maybe the coil if needed. I have a $40 Ebay distributor in my Regal that works great in my 355 SBC but I later installed a Pertronix module and coil to hopefully add some long term reliability.
 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,941
19,990
113
Socialist NY
I have a non HEI MSD in my Malibu and a DUI in the Olds both have worked flawlessly.

There was a noticeable difference in the Olds when I installed the DUI.

But to be fair I did also remove all the computer control junk
 
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