In the "relative to automotive" category there are two other popular large scale models made, motor cycles and engines. Here I am going to

I also prefer the injected Offy, but GMP did also make the Offy in a later turbocharged version. I needed both versions.

How about some GMP Ford Flatheads and the Ardun overhead derivative:

How about a couple of small block Chevy motors; a Monogram 1/6 scale kit, and the very rare Franklin Mint 1/6 cutaway version:

The Corvette club 'rivet-counters' evidently found some faults with the FM motor and it got bad press as a result. I, however, am really delighted to have one of them. 

@clifford-read Me too !

@clifford-read You have to have a flathead or two...

@clifford-read I consider the Franklin Mint FI a classic and I believe the oldest (model manufactures date) engine I have!

@josh  This reasonably rare German made visible Ford 4-cylinder motor was assembled from a kit that came in this box.  Not as detailed as the GMP motors, it does fire (tiny light bulbs) on all cylinders when turned by a crank.

This Nascar Richard Childress Racing/Dale Earnhardt Chevrolet motor in 1/4 scale was produced by Action around the turn of the millennium

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A couple of 1/6 Ferrari motors by GMP:  the 250 GT with engine sounds and shifter

And the 312 PB....also with shifter and corresponding engine sounds

@clifford-read Very interesting, what scale is that/

@clifford-read These were very nicely done but I'm sure someone else made them for action. I like the autographs on them too, I display mine with the air cleaner off!

@clifford-read The Ferrari series was fantastic, there was one more, the 250 GTO engine...