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Originally Posted by L8apex32
Does it seem logical that this has to be an airflow issue (either intake or exhaust) since the A/F ratio looks good?
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Maybe the A/F ratio needs to be altered outside of the typical normal band to resolve the issues. Maybe it needs to run much richer or leaner to suit this situation................more of a question or guess on my part.
Some reading on the topic I've done lately suggests that you are on the right track in attempting to tune the intake to match the exhaust cycle.
Exhaust System Theory 101
Exhaust System Theory 101
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The objective of most engine modifications is to maximize the proper air and fuel flow into, and exhaust flow out of the engine. The inflow of an air/fuel mixture is a separate issue, but it is directly influenced by exhaust flow, particularly during valve overlap (when both valves are open for "X" degrees of crankshaft rotation)...........................
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I would ask Buckley for help on this issue, they must have run into this before themselves during product development.
In the end; this just might be too much header for this engine.
You could exchange the headers for smaller diameter ones or get more hp out of your engine to fill out the power capacity of these headers.