Not Ranked
Just on the split plane manifold. They are better I think for normal driving and low end power than the single plane ones. I have had both and I believe the single plane made more power but at a higher RPM. I never had any problem with either so far as engine run on. I had over 500 horse in the Cobra that I sold and it had the single plane. The 69 has 440 horse and the dual plane and I hardly ever touched or had to have any tuning done on either of them once they were ran and set.
Ron
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