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Old 02-13-2010, 06:37 AM
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I feel that on a street engine that is running well with an HEI you will not even notice a difference in how the vehicle performs or the mileage it gets, I've done it and noticed very little from it. About all I could tell is the plugs stay cleaner if you are trying to run a too cold plug instead of the correct plug. If you were switching from points or didn't have an ignition at all and were buying from scratch I would say get a CD ignition. In your case I would find a better place to spend the money, the HEI is quite durable and fool proof, and if you are not suffereing from a miss at high rpm you are fine.
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