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  1. J

    M37 Horse Power Increase

    [ By the way, I had a great time cruising (30 ft. twin 250 HP IOs) around the San Juan Islands near your Vancouver BC and Washington USA. The San Juans are a great place to cruise. I personally like Friday Harbour, Rosario and Roche Harbour, but all the spots are nice to visit. My family...
  2. J

    M37 Horse Power Increase

    For the benefit of those who don't frequent the G741 site, here is a link to some interesting flathead mod stuff. There are still some 'speed' parts out there but I suspect this is going by the wayside as the experts age out of this hobby. Finding a decent machine shop that still has some old...
  3. J

    M37 Horse Power Increase

    I have to disagree that the 230 and 251 are almost the same in performance. I own both in an ex USAF M37 and several CDN M37s. The 230 is gutless for all but flatland driving, while no power house the 251 does make a difference, if there is one at 45MPH. The hills is where you notice much of...
  4. J

    M37 Horse Power Increase

    An option for those who want to stay with the a flat head would be to source a CDN 251 and do a swap. This would let you keep the reliability and original design off road ability and a bit more power on the long uphill grades. The 230 has its limitations no matter what you do with it, same as...
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