Hei conversion troubleshooting
Greetings all.
I just completed an HEI conversion on my 360, and am having an issue that I believe is due to insufficient voltage to the coil+module. I spliced a factory style gm coil connector into my old points harness, eliminated the ballast and spliced those connections together also. I used crimp and solder connections, and it runs like a top until i try to rev up past about 2k then ignition cuts out sporadically. I diagnosed this with timing light, it goes intermittent and engine runs like **** and backfires when revved past about 2k.
Brand new standard ignition FD478 coil, LX-301 ignition module (not the cheap "T" models, the good ones). Both are independently grounded to the block. New 8mm wires and brass terminal cap.
All the instructions I have read say that the coil should be supplied with a 12gua wire. The factory harness is 18gua I believe, and the factory coil connector had even smaller, 20 or so. Does this seem like the source of my problem?
If so, it seems that my only option is to get 12v constant hot with a 12gua wire off the starter relay lug, and use a relay to switch it on to the coil.
HEI experts, please chime in!
If you are going to tell me to buy an MSD 6A box, or that points worked fine, or some other HEI unrelated advice, please move along! No disrespect intended, but that's not helpful to this situation.
I just completed an HEI conversion on my 360, and am having an issue that I believe is due to insufficient voltage to the coil+module. I spliced a factory style gm coil connector into my old points harness, eliminated the ballast and spliced those connections together also. I used crimp and solder connections, and it runs like a top until i try to rev up past about 2k then ignition cuts out sporadically. I diagnosed this with timing light, it goes intermittent and engine runs like **** and backfires when revved past about 2k.
Brand new standard ignition FD478 coil, LX-301 ignition module (not the cheap "T" models, the good ones). Both are independently grounded to the block. New 8mm wires and brass terminal cap.
All the instructions I have read say that the coil should be supplied with a 12gua wire. The factory harness is 18gua I believe, and the factory coil connector had even smaller, 20 or so. Does this seem like the source of my problem?
If so, it seems that my only option is to get 12v constant hot with a 12gua wire off the starter relay lug, and use a relay to switch it on to the coil.
HEI experts, please chime in!
If you are going to tell me to buy an MSD 6A box, or that points worked fine, or some other HEI unrelated advice, please move along! No disrespect intended, but that's not helpful to this situation.
