How would these perform on a 327ci with flat top piston ?

3998993....72-73...307/350......75cc chambers
3998993....current..350.........Goodwrench crate motors,"Hecho en Mexico",75cc chambers

 

<insert gagging sounds here>

You'll end up with a ridiculously low CR, and no flow. In other words, a dog.

 

They're good castings but would have low compression ratio for a 327 with flat tops. They're better suited for a 350 or 400.

 

Thanks Guys, thats all I needed to know...have a great day. Im going to go with World Sportsman II. Im thinking 64cc chambers, what ya think?

 

64cc is a more reasonable #. It's just about right with flat tops on a 327.

 

You can get a good street compression ratio with these heads on a 327 if you have them flat milled .060".
This should reduce the chamber volume to 67cc's.
On a .030" over flat top 327 that is "0 decked" , using a felpro .039"
gasket,, your cr will be 9.4 :1... If the piston is .025" below
deck use a .015" shim gasket (factory type).

They will give good flow when ported.