I could see a 1.77 valve on a 400 cfm E-Head but many suggest about 70% flow for the exhaust side vs the intake side.
My little 1.71" diameter exhaust valve and port flows 255 cfm at 25" of water test pressure, which would say that the intake
should be 365 cfm with no flow match issues.
How much airflow do you want out of these heads Joe?
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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