25 horse kohler heads

#1 cylinder is the higher one of the two or closer to the flywheel. Any lawn mower repair business should be able to get a head with the model and spec numbers.
 
They should be numbered in the casting if I remember correctly. If you switch them on the engine the valves will be in the wrong position. Meaning the exhaust will be on the intake side..
 
As they said the castings are numbered 1 and 2. They also have a part number cast into them. Other numbers will interchange but some do not. The last few times I needed one I sourced it on Ebay. There were many updates over the years and depending on the age of your engine you may have all , some or none. It is always a good thing to install them. Important ones that come to mind are the fasteners and rockers. Kohler has the best manuals in the business and unlike some all you have to do is go to their site and down load them for free. The updates are detailed so there is no guess work and if you are willing to follow the instructions all goes very smoothly.
 
one is always closer to flywheel any good shop can get for you just need know model, code, spec. can get you one if that be any help
 

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