Ok so i got a big Chev, roller cam and Ls6 (pop up) pistons. Msd style billet dizzy, magnetic trigger (not crank) and a 6al msd. Ok so the ******* wont start. No points so i reasoned that if i hook up my snapon timming light to number 1 with the plugs out and grounded i can at least time it at zero at tdc. All the plugs fire. So if i give 10 degrees advance and put the plugs in, and wind it over, zippo. Even the timing light refuses to fire. So what do you think? leads braking down or a bad earth. I should point out it's a race car and i dont run a generator. Also it all worked fine six years ago. The major change being the new dizzy in place of the old Mallory duel point and a re wire.