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These Dougs D 453 headers...are these 1 5/8 or 1 3/4 inch tubes ?

At what point do you go to 3" over the 2 1/2" pipes ? I would believe 2 1/2" is enough for a 318, but is that enough for a 340 or 360 ? For street driven street/strip type cars. For dailey driver I would think 2 1/2" is plenty but if building a very high performance 340/360 or even a...

Yes, lean.. unequal fuel distribution, there.