Header design

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 the driver's side rear tube (in yellow) must be about 10"-12" shorter than the next tube (in red).
-I guess all we can do is create our headers properly or reconfigure existing units to work as they should and not give ourselves tuning headaches.
 This would mean that the shortest primary tube would not create a scavenge for that cylinder, so that cylinder would not make the same power as the others, and would require different jetting and timing than the others as well. How do you do that with a standard kettering distrubutor and an simple carburetor?
+I guess all we can do is create our headers properly or reconfigure existing units to work as they should and not give ourselves tuning headaches. When big name header manufacturers say equal length, they must be talking out their collectors.
 Now we get to the collector - ever see a header with 1 5/8" primaries that had a 2 1/2" collector? No, me neither. But that is the optimum diameter for most street headers. Run that right into a 2 1/2" exhaust and you have a sweet system, lots of torque where you need it and better fuel economy. The collector should have a gentle smooth shape from the four tube area down to the final diameter as well to keep things moving smoothly.

Revision as of 14:18, 28 November 2006