tufcj
Not sure what the exact OD is. I have run into a couple of Edelbrock manifolds where the stock tube fits loosely due to casting tolerances. One was the R4B on my AMX. I bought the stainless tube/aluminum cap from Bulltear, and had to send the tube back and have MC re-machine it with a little larger OD. Usually a film of RTV will hold it and keep it from leaking.
Bob
tufcj
