[markjohnson]

I've got an old magazine with a feature of an NHRA Stock Eliminator LS-6 Chevelle and I was quite surprised to hear them say that back-to-back the '569' pancake was about the same as the '163' high-rise manifold. Now this was with stock camshaft specs and they stated that with a more radical cam and a higher RPM range that the '163' would probably surpass it.