Posted by pete 23 on February 14, 2010 at 10:29:25 from (173.87.0.197):
In Reply to: m head swap posted by lee. s on February 13, 2010 at 20:42:41:
A 400 gasoline head will give you a considerably higher compression ratio than you have with a kerosene head. Should gain a few ponies. I think I would try both carburetors to see which one gives you the best performance. As the 400 used a 25 degree spark advance at full throttle, you may need to adjust your M ignition. Most M's used 40 degree with battery ign and 35 with magneto. Bore size will also affect comp ratio. I would only resurface head if it is needed for flat true surface
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