...I got a 2017 GT with a 5.0 what I assume to be a Coyote motor, the Voodoos are only GT350 right?
Correct. Coyote was the Ford code name back in 2009-ish
during development. The motor debuted in 2011 and output
right around 400-ish HP using 11:1 compression. The F-150
5.0L motor is identical except for camshafts and 10.5:1
compression that favors torque and reduces the chances
of detonation while towing in hot weather.
As always, subtle improvements have occurred since 2011.
The biggest change is to the computer tune which pushes
output to about 440-ish HP with premium. However, all
Coyotes have aluminum blocks, internally balanced, forged
steel cranks, cross-bolted mains, cam phasing on intake
and exhaust, and spin to 7K with no problem.
The "Voodoo" Shelby 5.2L GT350 engine is very different,
athough it is technically a variant of the original Coyote.
I won't go into all the details, but it's a racing beast.
The Voodoo runs 12.5:1 compression, spins to 8.5K,
and outputs 580-ish HP.
Ford refuses to sell a Voodoo motor except in a Shelby.
They're keeping tight reigns on warranty motors. However,
Ford Racing released the A52XL crate motor which is
practically identical to the Voodoo except for 12:1
compression and a traditional cross-plane crank. Both
changes are better for a street hot-rod in my opinion.
Finally, the 2018 Coyote is supposed to include many of
the latest changes as the Voodoo and A52XS motors (plasma
lined cylinders, higher compression, etc). Better yet,
Ford is finally using Direct Injection in the Coyote and
increasing compression to 12:1. The rumored output will be
460 HP. Pretty awesome for a 5.0L production engine with
no forced induction.