Hello i have a question on spark plug gap on my 140 pg covair with HEI distributor small cap! Do i need too increase the gap too make my electronic HEI distributor work more efficient like 50000 or leave it at factory corvair setting ! My voltage is 12 volt at coil and i am runing a 45000 voltage accel coil!thks

0.45" seems normal for most with the HEI

I second the .45 gap but with a hot coil you should be fine with .50

I have experimented with the mostly stock small block chevy in my dirt track car all the way up to .77 before I saw high rpm breakup but found no real gains past .52 where I thought it felt maxed out.
I ran a "Dyna Mod" hot module with a stock coil reliably for years.
The only failures I ever had were with Acell coils, 2 in 3 yrs with .45-.47 gap.

Mind you this was with the "large cap"

Ed
65 Crown/Wills Corsa



Edited 1 time(s). Last edit at 03/22/2009 04:11AM by 65 Crown Corsa.