Blasters ARE oil filled for the most part. Howeve, before 2002, all Blasters, and most other il filled round coils, stock and performance, including MSD Blaster 2, 3, were made at Andover Industries, Andover, Indiana, good stuff. Then, the EPA came out with the oils inside coils were murdering billions of people, wich stopped Andover from building oil filled coils, they still build some epoxy filled junkers. Oil filled coil production went all over the world, Crane and Accel to Taiwan, Mallory to China, and MSD, well, to a company named Pro-Bobbin in Juarez, Mexico, straight across the Rio Grande from El Paso. Pro-Bobbin elected to use a very inferior wiring rounds insulation that degraded and disintegrated when oil hit it, and fell off the windings spools.
When that insulation fell off the windings, it was called a :Layer Short", layer was the windings layers, and short was those windings touching together, shortening the windings lengths to the point of coil failure, and overworking modules of all sorts to failure. Sometimes the coils were assembled faulty, sometimes it took a while gradually failing the coils. Ever seen posts that said "Those darned HEI modules (or, MSD box) are sure junk, I had 4 in a row fall FOR NO APPARENT REASON"? Well, NOTHING fails for NO APPARENT REASON, NOTHING. That is why the MSD coils were so bad for a few years after manufacture went to Juarez, Mexico. Blasters are now ALL made n China, mediocre coils now, didn't use to be.
This is also why old resistance tests are no good to test a coil these days. Resistance will tell you if a coil is possibly functional, or, dead on arrival, but not if it is good any place else. RUNNING THE COIL ON AN OFF VEHICLE ELECTRICAL TESTER IS THE ONLY WAY TO DO IT RIGHT. Most coils work just fine when dead cold, with the faulty ones showing failure along the way to full operating temps, Ever had module failures when the coil ws cold, not often at all, the failures always seem to happen when the ignition gets to some level of heat as it warms up, or, gets to full ops temps.
MOST good auto parts stores have the off vehicle testers, tell the parts drone to leave the tester on, get the coil hot, not a simple 5 second blast, and "hey, man, it's just dandy".
How did I find all this out, not on a web board. I had one customer have a few module failures, and asked to have the entire system and coil back. I ran the system on my distributor tester, failed 3 modules straight off, about 30 seconds operation each. I then swapped another new module into the system, added a new coil, ran it for an hour, not even a sneeze. Then, swapped the original coil, same module, module failed in 30 seconds. Another new coil, back to user, and that conversion is still running, over 18 years now, not one more fart, belch, backfire, bang, boom.
Yes, I blamed the coil, rightfully so, and have seen a lot more Blasters take all sorts of modules out, all those Blaster coils, and ACCEL, Crane, Mallory from faulty manufacture.
About the RtQ distributors, I have converted more RtQ units than any other MSD unit, very close to the same number of PerTronix failures, more than any of you would ever believe.
Now you all know why I am staying away from posting on boards. I am forced to defend every post I make, from a small handful of people that just do not know what they are talking about. Most of you are great, there are always a small few that only cause never ending trouble, and I am fed up with it, see ya, until the next time I am told I don't know what I am talking about, but actually do.