Solex 27 #1 Posted August 14, 2015 I must admit that I am a fan of the Magnum engine, and the 300 & C Series tractors due to attachment compatibility. What was the first year that the Magnum engine was offered for the 300 series tractors? There seems to be a good supply of 300 series tractors on Craigslist, but many have the old K series engines. I was able to find a good M-12 over the winter, but don't see see that many available up here in NH. Share this post Link to post Share on other sites
tunahead72 2,551 #2 Posted August 14, 2015 I believe the Magnum was first available on the 1986 308-8 and 420-LSE models, and in 1987 for the remaining 300 and 400 series models.You can check the model lists in the picture gallery for more details. Share this post Link to post Share on other sites