Cleveland cylinder heads

To fit 351C engines, it is generally accepted that there are seven types of production Cleveland heads that you may come across, five U.S. and two Australian.

They are:-
U.S. 4V Closed chamber with a ‘4’ cast in the corner
U.S. 4V Open chamber with a ‘4’ cast in the corner
U.S. 4V Closed chamber with a ‘4’ and a ‘dot’ cast in the corner
U.S. 2V Open chamber with a ‘2’ cast in the corner
U.S. 2V Open chamber with a ‘2’ and a ‘dot’ cast in the corner
Aus 2V Open chamber with nothing cast in the corner as fitted to Aus 351C
Aus 2V Closed chamber with nothing cast in the corner as fitted to Aus 302C

To take them in turn.

The U.S. 4V closed chamber head with the ‘4’ casting is the head fitted to the CK608 and CK609 engines installed in XW and XY GT’s. These heads were fitted to imported ‘D’ block engines.

The U.S. 4V open chamber head was not fitted to any Australian Ford.

The U.S. 4V closed chamber head with the ‘4’ and ‘dot’ casting is the head fitted to the CK617 engines installed from mid 1972 XA through to end of 1973 XB manual transmission equipped GT’s. It has a slightly larger chamber than the ‘4’ only casting with a resultant half a point compression drop in C.R. These engines were imported ‘square’ block engines.

The U.S. 2V open chamber head with the ‘2’ casting is the head used on the CK601 and CK604 engines in XY’s and ZD’s. These were imported ‘D’ block engines.

The U.S. 2V open chamber heads with the ‘2’ and ‘dot’ casting in the head were used on the CK614 engines fitted to late XY’s and ZD’s. These engines were imported ‘square’ block engines.

The Aus 2V open chamber head with no casting mark is the head fitted to Australian built 351C’s fitted to XA’s through to XE’s with both four barrel and two barrel carbs.

The Aus 2V closed chamber head with no casting mark is the head fitted to Australian built 302C’s fitted to XA’s to XE’s with two barrel and four barrel carbs. It has the smallest chamber size of any of the production Cleveland heads.