Im putting together a 1984 302 and bought speed pro hyperthetic pistons. I have a pair of 1968 289 heads and hoping there 58 combustion chambers. Does anyone know if they are. If they are 58 so I can have around 9 to 1 compression ratio.


mercurycapri said:Im putting together a 1984 302 and bought speed pro hyperthetic pistons. I have a pair of 1968 289 heads and hoping there 58 combustion chambers. Does anyone know if they are. If they are 58 so I can have around 9 to 1 compression ratio.![]()
maverick0716 said:Are you sure about the E7's flowing less? Stock non Hi Po 289 heads don't flow well at all......I doubt they're better than E7's.
I pretty sure they do flow less unless the data i have found on the internet is wrong. Here is the link go down to the ford section under windsor.maverick0716 said:Are you sure about the E7's flowing less? Stock non Hi Po 289 heads don't flow well at all......I doubt they're better than E7's.