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OK it turns out the head doesn’t have those bigger exhaust ports. Just needed a thick gasket and the slightest bit shaved off the manifold. Now...
Thanks everyone -- especially Professor Fate -- for the input. I'm guessing that as you said, I have a '73+ head that has those extended ports. If...
72 Swinger. 318 Long story short: I had a reman 318 put in the car and it came back with a cracked driver exhaust manifold near where one of the...