Back in March of this year, a weird Ford Mustang Shelby GT350 test mule was seen testing out on the streets with a massively weird bonnet bulge. It's something that no one has ever seen before, and there were many speculations as to what it actually was.

We partook in the bevy of guesses before, but now's the time to learn what's really under that odd strange bonnet, courtesy of REVan Evan on YouTube with the help of Mark Wilson from Ford.

If you're one of those who guessed that it's a 7.3-litre pushrod V8 mill inside that bonnet, you're correct. That awkward bulge was actually added to give clearance to the upward-facing entry point into the intake manifold.

Gallery: Mustang Shelby GT350 Test Mule Spy Photos

However, this doesn't mean that a Godzilla-powered Mustang is on its way. According to Wilson, this Shelby GT350 is simply a testbed for an upcoming manual transmission control pack for the 7.3L pushrod V8 crate engine. It will be available for purchase in the fourth quarter of this year.

Of note, the massive Godzilla V8 crate engine with a 10R140 automatic transmission control pack is currently available through Ford Performance. 

Ford has put its foot down in 2020, saying that there wasn't a plan to shoehorn the pushrod V8 into the Mustang. That still appears to be the case with this revelation.

However, it's important to note that a prominent member of the Canadian Auto Workers union mentioned that a 6.8-litre version of the pushrod mill would be used in the derivatives of the Mustang and F-150. Ford has never confirmed that statement. But as they say, never say never.