Whistler or no whistler, that is the question

[crownjewel4]

Little help,
Can anyone tell me which, if any, of the attached engines are whistlers. Also, what to look for to identify one.

If not whistlers, what do they look like respectively.

Thanks much from a hopeful new Deuce owner.

 

[GoldComet6]

I can't tell from that angle, since you can't see the turbo. I believe the "C" turbo gets narrower and the "D" is the same width. This post shows close up pics that will clearly show the difference between the two.

This should help....
http://www.steelsoldiers.com/deuce/32420-turbo-differences.html

Someone else with more knowledge can correct me if that's wrong.

 

[derby]

I believe the engine on the left is a non turbo.