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My heat riser was really stuck as well, but in the closed position. This is while the manifold is on the car, going through heat and cold cycles. I soaked it repeatedly with PB Blaster, and also purchased Mopar Rust Penetrant based on comments of folks on this forum. It wouldn't budge. I...

Thank you to 413 for the picture of the manifold with the Heat Riser. That gave me the info I needed to figure out that my heat riser was frozen in the closed position. I'd been soaking the heat riser mechanism with PB Blaster and was about ready to drop the exhaust pipe to get to it, but I...