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Flow 397 on intake & 299 on exhaust, 2.180 coated titanium intakes 1.600 titanium exhaust, 1574 PSI Springs. 165 laps on dirt latemodel since fresh. Took this top end off and put the Edelbrock heads and intake on lookin for more power but didn't help so these are good heads. $3500.00 402-379-2230 or 402-640-3996