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Re: 1972 c20 running problems
Bump your timing up to 12 degrees. Make sure you plug the vacuum line to the distributor when you set it.
When you put in an hei did you run 12 volts to it?
Heat riser is a valve in your exhaust that's situated between your exhaust manifold and the exhaust pipe. It will be closed when you first start up. It's controlled with a coil. When the coil heats up the valve opens. It should only be closed when motor is cold. Maybe yours is stuck shut.
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