As an owner of 2 sets of these heads and the car they came on this info is quite interesting and valuable to me if for nothing else bench racing at my point in life. One needs to consider that flow testing was, at best in it's infancy if existent at all in 1959-60. Also to point out that the aluminum 4V manifold that these heads were used with was laid out on Don Frey's kitchen table...So much for Hi-Tech. Even in their untouched form the numbers aren't as bad as they seem on the surface as these heads were on a 352 cubic inch engine, not some big inch "mountain" motor. When all is considered for the era the HP 352/360 didn't do that bad when put up against it's competition. This was FoMoCo's first [and some say feeble] attempt at high performance since mid 1957 but that was with the Y-Block, not an FE. I'll go as far as to say that flow testing is, IMO over rated as the numbers are somewhat squed[sp?] It does not reflect real world port flow in a dynamic running engine. It is static flow, one way and does not account for the opening/closing of the valve, port velocity, reversion, wet/dry flow, provides little info of flow under the cam's lift curve and no accounting for manifold, carburetor size and efficiency. Is flow testing worthless?...No, It provides usable and valuable info for port, bowl, combustion chamber and valve work as a 'before and after' comparison as Tommy's noble efforts have provided. [Thank you, Tommy] Flow testing has it place in the quest for making more power but I don't live and die by the raw flow data that most have when they go to the time and expense of flow testing heads. I will now step out of the line of fire as I know this may have ruffled some feathers.