[25stevem]

Actually you would be wrong about that if your talking about peak flow numbers.

In terms of a SBC 1972 era head like a 487x casting with its 1.94” intake valve the peak flow @.600” can be 205 cfm, which is a dead match for the average Pontiac head with a 2.11” valve from the factory.

This is because the Throat in the SBC heads like the 487x is a hair bigger then our D port Pontiacs.

Even a hood SBC 462 casting with a 1.94” intake will break the 215 cfm@28” mark at .600” lift..

The SBC Vortec 906 casting with its 1.94” valve will top 225 cfm.