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I finally got through from home last night. Took a while however.
I tried out the header formula based on certain engines I've built over the years. It seemed to be pretty decent for a 'guesstimate', far better than if you were just 'winging' it. It doesn't however take into consideration existing port dimensions. It would be tough to built a 1.25" primary header on an Opel head! But it does prove a point, headers usually need to be much smaller and longer than those that are supplied by the mainstream manufacturers, at least for street use.
Bob
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