ok i know the d0oe flows like a gt 40 but how good are the c9oe headsare they comparable? or is one better than the other?

 

Hey,
The "9" in C9 is for 1969... The "0" in D0 is for 1979... However, some D0OE heads made it onto some of the Windor powered cars. 1969 is the only production year for a 351w 4barrel as far as I know. The very smalldifference between these heads are the combustion chambers. The D0 heads have a 58.9-61.9cc chamber, where the C0 heads have 56.3-59.7cc chambers. The smaller C9 chambers would slightly raise the effective compression ratio.

Indy

 

Oh yeah... Also the C9's may not have the exhaust gas cross-over casted into them like the D0's, but that I'm not sure about. I've got the D0's sitting on my parts shelf.

Indy