Right now I have the correct aluminum dizzy in my 68 GTO. However when I bought it used in 1976 with 90k miles on it, it had an iron unit installed. I assume replaced at some point by the original owner (he was not mechanically inclined so had to be done at a dealer or shop). I replaced it with aluminum for originality sake ... makes me wonder if the dealer/shop knew something back then and I should go back to the iron unit which I still have. When I was building the engine, half a dozen times I picked up that iron distributor and contemplated if I should use it .. I like iron thing ... but ended up opting for a correct aluminum one.
I'm guessing the original aluminum unit crapped out at some point in the first 90k miles.
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