Ford 272 C.I. runs low 11's. Why do Mopar guys need 408's?

273 said

We got light cars, I thought 302 had poor flow, doesn't a 318 head flow better?

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Trick Flow sbm heads are 195 cc. There are cnc'ed small Ford heads available with 225 cc. Flow 100 cfm more than a 318 head (or more). 195 cc sbf head is ordinary aftermarket.