Coffee Brake: Sacrilegious Engine Swaps

You’ll see a few questionable engine swaps on these pages, mostly because they make for good publicity, but also because they often make the car better.  However, some engine swaps are downright taboo — Chevy in a Ford (and vice versa) will get you dirty looks at car shows and forget about taking a non-Porsche powered Porsche to a PCA club track day.  With that in mind, I’d like to make the topic for today’s Coffee Brake: what makes a sacrilegious engine swap?

Let’s start with this 1970 Ford Mustang Boss 302 found on ebay with a few hours to go with bidding at $17,500 and just sold for $21,500.  Did I just walk through a wormhole to 1995?  Why is this so cheap?  Oh, the paint is a mediocre quality color change and the engine is a non Boss 302 from a different Ford.  Finding the original Boss 302 is impossible and getting a correct era Boss 302 is going to be expensive, plus the Boss 302 is kinda lame from a performance perspective compared to modern engines. Perfect car for an engine swap.

The logical engine to swap into this thing is this 2012 Coyote 5.0 liter V8 with 6-speed manual transmission offered for $6,499, plus an ECU/harness for another $1,649. The resulting 420 horsepower will be reliable, tractable, and sound perfect with a free flowing exhaust setup…but…it lacks the maniac fringe that keeps me awake at night.

Here is what you need to shove into an unwanted ’70 Boss 302.  This is a 2012 3.5 liter Ecoboost V6 from an F150.  It pushes out 365 horsepower and 420 ft-lbs of torque…before you add a chip tuner and intake to boost it to 415 horsepower and 505 ft-lbs of torque.  It may well weight more than the 5.0 Coyote V8 (once you add turbochargers, intercoolers, and all manner of crazy extra parts, but it makes up for this mass in TORQUES.  ALL THE TORQUES.

Anyway, the question is — is a twin-turbo V6 in a Boss 302 Mustang a sacrilegious swap?  And what is the craziest swap you’ve ever seen.  Go, discuss amongst yourselves.