Cobra block question

Mustangscotty · 08-05-2010, 10:30 PM

Went ahead and did the mod where a hose is added connecting the back side of each head.

Forgot the actual name of that mod, also added a larger radiator.

Did some research in the Sean Hyland book and found this..

Primarily, the Windsor plant has produced the 4.6-, 5.4-, and
6.8-liter modular engines used in the Ford trucks, while the Romeo based engines were slated for use in the car lines. Changing demand and availability, however, has resulted in the Mustang in particular being produced with both versions since 1999. The major difference between the two is the main bearing caps and the main bearings themselves. Each of these engines uses different main bearing sets that are not interchangeable. It is difficult to mess this up, because the tangs are different between the two main caps.

The 4.6 Windsor iron block is readily
identified by the large W cast in the
valley area and also in the front of the
block. The other 4.6 iron block is the
Romeo. The main bearings of the
Windsor and the Romeo are not
interchangeable.

It appears 03/ 04 Cobra's use blocks from two different assembly plants.

08-05-2010, 10:30 PM	#9
Mustangscotty Senior Member Join Date: Dec 2007 Posts: 699	Went ahead and did the mod where a hose is added connecting the back side of each head. Forgot the actual name of that mod, also added a larger radiator. Did some research in the Sean Hyland book and found this.. Primarily, the Windsor plant has produced the 4.6-, 5.4-, and 6.8-liter modular engines used in the Ford trucks, while the Romeo based engines were slated for use in the car lines. Changing demand and availability, however, has resulted in the Mustang in particular being produced with both versions since 1999. The major difference between the two is the main bearing caps and the main bearings themselves. Each of these engines uses different main bearing sets that are not interchangeable. It is difficult to mess this up, because the tangs are different between the two main caps. The 4.6 Windsor iron block is readily identified by the large W cast in the valley area and also in the front of the block. The other 4.6 iron block is the Romeo. The main bearings of the Windsor and the Romeo are not interchangeable. It appears 03/ 04 Cobra's use blocks from two different assembly plants. __________________ Scotty 67 Mustang fastback 68 Mustang coupe 03 Cobra 13 F150 4x4 69 Harley FLH 67 Camaro Last edited by Mustangscotty; 08-06-2010 at 12:44 AM.