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Why don't you show us some voltage (in terms of kilovolts or 1000's of volts) vs a measuresd dimension. Show us some pix of your adjustable spark gap tester....like brand name, test conditions. The comment: "got a blue-white spark over 3/8" means nothing....it's like saying a little pregnant....the spark is in air...not in the interior of the engine, at temperature and under compression, given a milli second of time to ignite the mixture....at 5000 RPM. The secondary voltage produced by the coil is determined by the primary to secondary volts per turn ratio. The argument that the conventional design vs the E core design is moot.....it's just the E core design is different appearing, therefore to some (the uneducated) is better...just because it's different, ....both, the are windings are of the autotransformer designs....one is oil insulated vs epoxy insulated....but the method the secondary voltage developed is identical...by magnetic induction........just my opinion of course......It would be interesting to see how well the hidden GM style ignition module faired out mounted directly to the bulkhead. VERY important that the module has a generous amount of heatsink compound between it and the mounting surface. You might also cut out some of the stock ECU case sides and bottom providing air flow. That module needs to breath or it will fry itself just like it did back in the 1970s.
You would be surprised how HOT the E-Core spark is. I have an adjustable spark gap tester that I hooked into my system after the HEI upgrade. Got a BLUE-WHITE spark jumping over 3/8 of an inch.
BOB RENTON