Originally Posted by LATECH
670 were a closed chamber?
Were they also a 22 degree valve angle head?
That would mean the piston valve reliefs will need to be 66 style and back. Also the 22 degree angle heads use shorter pushrods.
Better do some more homework before buying .
The 67 326 still used a 22 degree angle head, and pistons that were reliefed for them, I am not sure about any others.
The 1967 heads was the last year of the closed chamber heads and that, along with the larger valves in the 670 heads, is the main reason they flow so well. The 1968- 1970 heads were open chamber heads with the same volume and made a little more HP at a high RPM than the closed chamber heads.