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I too am interested in the Sterlings as my boat was originally powered by a pair of Viking II engines rated at 600 hp on gas. This was an 83 foot Coast Guard patrol boat. There have been several 6 cylinder sterling marine engines going back to before 1925. The Chevron series have a 5.5" bore and 6.75" stroke for 962 cubic inch and were rated @ 35hp@ 400 rpm, 85 hp @ 800 rpm, 130hp @ 1200 rpm, and 150hp @ 1500 rpm. The smaller two weighed 3250 lbs and the others were 2620 lbs. The Dolphin series are 5.75" bore and 6.75" stroke for 1052 cubic inch and had various ratings ie Dolphin Medium 110 hp & 165 hp @ 800 & 1200 respectivly and 2980 lbs. Dolphin 187 & 225 hp @ 1250 & 1550 respectivly and 2900 lbs, Dolphin Special 275 & 290 hp @ 1750 & 1950 rpm respectivly and 2900 lbs. Petrel series. Most were 5.25" bore and 6" stroke for 779 cubic inch and were rated 75 & 115 hp @ 800 & 1200, 115 & 145 @ 1200 & 1500, 145 & 180 @1500 & 1800, 180 & 200 @ 1800 & 2100. All were 2050 lbs. There are two other Petrels that are not the same as the previously mentioned.
The smallest Petrel was 4.875" bore and 6" stroke for 672 cubic inch and rated 65 & 125 hp @ 800 & 1500 rpm. The last is the same size as the bigger Petrels but called Petrel Red Gear. It was rated 140 & 190 hp @ 560 & 675 rpm and was 3460 lbs. Coast Guard series. So called because of there great popularity with the Coast Guard in there 75 foot patrol boats of 1926. They were 6.25" bore and 7.75" stroke for 1427 cubic inch and rated 100 & 225 @ 600 & 1200 rpm, and 225 & 300 @ 1200 & 1500 rpm and were 4700 lbs. And the last was the Viking II series with 8" bore and 9" stroke for 2714 cubic inch and were rated 125 & 190 hp @ 450 & 600 rpm, 190 & 300 hp @ 600 & 900 rpm, 300 & 425 hp @ 900 & 1200 rpm. They were 8975 lbs. All of the weights listed are with marine gearbox. Most engines were available with an aluminum crankcase. Most of thier engines were dual overhead camshafts, multiple carburation, multiple ignition, and even two oil pumps. I believe all of thier engines were gasoline but they did offer some diesel kits for the 8 cylinder Viking II in 1947. I have not been very successful in tracing the history of the company. Hopes this helps a little. I have a little more info should you wish to e-mail me. LOL, Ken Liden
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