Coil works great. Definitely brought back some of the 20 year old performance when a different coil was installed. The only problem is that the coil wire is short. Though it didn't matter much. The coil wire threads into the coil so simply unscrewing and replacing with a spare from my truck solved the length issue. I used this on a 335. I'm pretty sure the coils are in the same place, so there might be an issue with the 400 and 500 as well.
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