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Funny, I called Lingenfelter yesterday to get that info and to order plenum/runner gaskets for my SR. They told me PN 15401 but I don't know if it references 1256 or 1204, which are the two AFR recommends for usage on their heads. When I get them I can measure the port size and let you know.
George,
Thats funny.I called yesterday also.That's a Dana part number I am not familiar with either.I would not know where to get that number/brand gasket if I wanted,except from Lingenfelter