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I would also like to know that measurement.
I could be mistaken, but If I remember correctly, I think I drilled holes in the cap for ventilation per MSD tech staff. That was supposed to help with the carbon issue. They also had me drill #30 holes in the bottom of the MSD box for condensation because it is mounted upside down.
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ERA#698 428, 4 speed Toploader, 3:31 Jag rear
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