[pumpgas]

Originally Posted by 1970chevy

i just bought a sonnys 555bbc i got here and it need the crank trigger so i went and bought a msd part # 8620 crank trigger and its for a 8inch balancer i got it home and i have a 7inch ati balancer on does that matter or should i pick up a sbc 7 inch crank trigger i am new to this crank trigger
thanks

You will def need the big block mounting brackets I would just run the 8620 and call it a day won't hurt a thing the ignition has no clue how big the balancer is.