360 in 273 Clothing for the ‘66 Valiant.

Professor Fate said

Cuz I done runned inta the same problum!

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Yup, just like trying to use the later smog heads. The extra casting under the driver's side rear exhaust port hits the factory exhaust manifolds and won't allow it to sit flat against the head. You tighten it down, and you break the manifold.