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Old 08-22-2018, 01:06 PM
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ol'George ol'George is offline
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Not to piss on yer parade, but
M-18's are a flat head engine, (and a dam good old one.)
Once you go milling the head other than say .040 you begin to shroud the valves.
Even then I'd clay the head to see what the valve to head clearance is.
As far as 93 or more octane, it is a waste of money and a decrease in power on a low compression engine.
Now if you are wanting to build a competition engine, pop up pistons, relieving the cylinder, special design CNC head, larger valves/ special cam,special flywheel rated above 4000, rpm's special intake/exhaust etc. etc. to name a few things, are a start.
But a flat head engine is not an inherently power house design to start with.
They are made for work & torque.
If you are looking for factory specifications look in the service manual available from kohler free, or here on our site.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.

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