Craig, this build is awesome to follow. You definitely have some mechanical skills and a keen sense for engineering. I hope the worst phase of the project is behind you so you can stay driven to see your vision to it's completion.
Just a question on the header flanges, which look fantastic. Are you familiar with reversion? In my experience (which includes according to my wife "way too much time" working with my flowbench) the trend is to make the exhaust tube larger than the head exit. Usually the upper 2/3 of the port will match for high speed flow, but if the tube is left round, there will be a step at the floor of the tube. During operation, the exhaust pulses will travel down the exhaust tube, reach the end and turn around (over and over diminishing). This is reversion, and these pulses can carry spent gasses back into the chamber reducing VE. The step helps block these pulses from re-entering the cylinder. Is this not a concern for turbo cars, or are you more concerned about WOT performance?
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Chris
1969 Firebird: injected Pontiac 462ci, T56
Last edited by Tinker; 11-10-2018 at 05:13 AM.
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