70 Polara Pinging Issue

Hello Folks,

I am having a tuning issue on a 70 polara and I think the issue is carb related. My guess is either the springs for the rods are too light or I have a vacuum leak. Here are the details:

The car is a 70 polara convertible with a 440, 727, and 3.23 suregrip. The engine was rebuilt 15,000-20,000 miles ago and never really had a problem with it. It has a stock iron 4 barrel intake and stock iron heads. It was rebuilt to either 69-70 magnum status. It currently has a Carter AVS...

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Author: carfreak6970