Cynlinder Head Help Needed!!!

[bad68coupe]

what is the difference, performance wise, in the shape of the combustion chambers for these heads?

 

[C0V3R]

Cant really tell with those photos.

 

[jes72mustang]

For one thing the ones with the smaller combustion chamber are going to have a higer compression ratio.

 

[danny clemens]

Post what the heads are (combustion chamber size, valve size and what they came off of) and somebody should be able to help you.

 

[57fairlane]

just from the picture, the aluminum heads look like they have some shrouding around the valve. 5 minutes with a carbide bit should pick up at least 5 cfm depending on how bad it is.