Differences in 11-12 and 13+ 5.0s

[Dominic Toretto]

I figured I would read around for crate engines. Wouldn't the engines have a different part number if something was changed? From the fordracingparts.com website part M-6007-M50 looks to be what comes stock in the cars. However when you go to this page http://www.fordracingparts.com/crateengine/Main.asp#mod, it says the horsepower rating is 412 but when you click on the link it says the horsepower is 420. Weird.

My original thought when I saw the hp difference was either an intake or exhaust change. It seems like that would be the case since there are no different part numbers for the 412hp and 420hp motors. Thoughts?

-Alex

[46Tbird]

There are different part numbers for '11-12 and '13-14 service replacement engines from Ford.

In Sept of 2012, my '12 GT needed an engine replacement at 23700 miles. The engine they put in it is a '13 service replacement (BR3Z6006J) and required a slightly revised wiring harness and they reflashed the PCM.

Picked up about 2mph in both the eighth and quarter...