OK, NOT where i was going, but NOT an HEI fan. Never had one work right, EVER........ worked and worked this one on Pickle......to no avail after about a hundo and a half. It's gone, history, garbage ttruck came this morning, new Mallory equipment in its place. Dialed right in yesterday, we'll see how it works out, but I'm betting I can break the 3000-5000 "hiccups" the HEI gave me constantly and not worry about the misfires and occasional start-up backfires i experienced (History has had these same afflictions with me and an HEI)
I'd LOVE for someone to teach me how to work those freaking things. But from a purely nuetral standpoint, I cannot see possibly how they stand up to whats out there!
Ray
You had one with a bad top bushing and it was causing the magnetic pick up ring to bounce....Very common...New upper bushing and change out the pick up and lock out the dashpot and you would have a distributor that is second to few...
Where an MSD really shines in in loaded acceleration, something most of our jet boats will never see....

MSD stands for multiple Spark Discharge, meaning it uses the CD box to store power and it hits the coil with multiple hits during a single spark signal.....Works good for keeping the spark plug lit
"lit" for a longer period of time.............

On a dyno sheet, it will show up as acceleration rate, the top HP/Torque numbers will be similar or same....You actually have to perform an acceleration rate test separately from everything else, not very common....
GT