One thing I have learned about MSD is they always seem to blame it on the ground or something YOU did wrong with the wiring ...read the forum on their site. which could be true a lot of the time..but they told one guy on there ,if I remember correctly, to ground both heads to the block (aluminum) and then the block directly to the battery. Wouldn't the solid motor mounts serve as a ground? Wouldn't the head bolts ground the heads to the block? And someone teach me how to keep every plug wire completely seperate on a chevrolet distributor cap? almost impossible with a standard cap..all you can do is seperate em with the loom thingamajiggers but they are still sorta criss crossing at the cap to some extent.( 8 and 4, 3 and 6)
A friend of mine had a 7AL3 in his dragster, it ran fine in the driveway or pits but would miss out down track. Sent it back to them, they said nothing wrong with it and blamed the grounds etc( which were connected properly to the battery)He put it back in...same thing. He sent it back again, they said it was fine. Put it back in..same thing. He got mad and bought a new one. Put it in hooked to the same wires and never had another problem. SO we put it in my car, ran fine in the pits and burnout box but when you hit 6200 it cut out as though it was on the chip( tried several chips even took it out all together)...just like it did to him. Took it out and put mine back in(same wiring ) mine works fine. They still said nothing wrong with it but ended up replacing it to get him off their case.