Darren,
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Using a constant speed prop may or may not be an option. It depends on if the engine is fitted with a "solid nose" or "hollow nose" crankshaft. Look on the front of the crankshaft. There is a raised ring on the front of the prop flange area. If the area inside this ring is solid steel, you can not run a hydraulically controlled constant speed prop. (Aftermarket suppliers offer some electrically controllable C/S props to get around this)
If there is a soft plug (similar to the cooling system plugs found on automotive engine cylinder heads and blocks) inside the ring, you have a "hollow nose" crankshaft installed and can convert the crankshaft for C/S use. Use the search feature to find threads here on VAF which describe how this is done.
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