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And 2 1/2" pipes fit on the stock 383 manifolds, right?

I have a 69 Roadrunner with a stock 383. What is the actual size of the exhaust down pipes? I have searched but can't find a number. My mufflers are blown out and leaking so I'm planning on going to 2 1/2" front to back this summer.

Thanks for the responses and info. Are the manifold bolts/studs going to have a tendency to break on me? And, are the studs that are in the water jacket the ones on the ends?

More issues with my semi-newly acquired 69 Roadrunner, 383 auto. I recently started hearing a ticking coming from drivers side rear exhaust manifold when cold. Looked around and noticed a nut missing from the stud on rear exhaust manifold port. It looks like the stud has been exposed for some...