I'm building a downdraft for a 4.6L v8. Need help with dimensions

I’m building a gasifier to run a Crown Victoria and I needed some help with the final reduction zone width, right above the grate. It’s looking like 6" is the goldilocks zone for such an engine size. Am I correct in this assessment? The system is basically the same as Keith’s BTW for anyone wondering about design. Thanks!


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Most of us are running 5.2 liters on a 7.25 inch restriction so i think 6 inch would be about right. Any chance we could get some pics of your vehicle and build we like to see progress.