Quoted TextDJ, the Squadron/Signal M4 Sherman Walk Around has excellent color shots of both the radial engine of the M4/M4A1 and the Ford GAA engine used in the M4A3. Highly recommended book listed at $12.96 in this month's Squadron flyer. (item #ss5701)
General question does any one have a colored photo of a Sherman engine? I want to find out the basic color of a factory fresh engine. I believe, for example, that the various flexible exhaust connectors are an orange color.
I can e-mail scans if you wish.