why upgrade the stock ignition system?
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
I'm sure the mechanics & racers will chime in but I thought it was because the coil can't build up a powerful enough charge quickly enough to jump the gap more than 6000 rpm.
Melting Slicks
Joined: Jan 2008
Posts: 2,054
Likes: 120
From: AZ
My engine pulls strong and hard to fuel shutoff at 6300 with a stock HEI. Chances are that your intake or the strength of the rotating parts will limit RPM before the HEI does.
Last edited by whalepirot; Dec 20, 2008 at 12:22 AM.
Racer
Joined: Feb 2008
Posts: 435
Likes: 0
From: Bulverde TX
Depends on year model. My '85 you need to install the new wiring harness to get ride of the old style capacitor and put in an Accel or Holly style ign. module to increase the RPM to 9000 if your motor can take it.
