Guest zfan Posted May 5, 2002 Share Posted May 5, 2002 Ok to start with Im running a sbc 350 in my 1971 Z. The ignition system is all MSD, Pro Billet mechanically advancing distributer, MSD 6a box and blaster 2 coil. The problem is at approx. 3 grand the car stumbles and misses severly and keeps on from this point up to who knows as I didnt want to push things and do damage. Anyone else ever have this problem? thanks, Mike Quote Link to comment Share on other sites More sharing options...
Mike C Posted May 8, 2002 Share Posted May 8, 2002 3k rpm is about the point where MSD goes from multispark to single spark so it could be the box, but usually they either worky or no worky . (above the 3k rpm point spark frequency is too close to maintain the multi-spark output, like SFI) MSD are VERY sensitive to resistance in power wire. Run at LEAST a 10 ga wire to the box and make it as short as possible. Ground is equally important and ditto on it's install, you may even want to run some new engine to chassis grounds. Also make sure and route the trigger cable from any EMF generators such as the alternator, coil wire and plug wires as well as the MSD power cable and battery cable. Quote Link to comment Share on other sites More sharing options...
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