could you force install OSX Mavericks onto a Apple MacBook A1181 early 2008 model if running snow leopard or mountain lion osx
To install Mavericks, you need one of these Macs:

iMac (Mid-2007 or later)
MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
MacBook Pro (13-inch, Mid-2009 or later),
MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009) 


Your Mac also needs:

OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
2 GB or more of memory
8 GB or more of available space


There are some attempts reported how to Force Install on non compatible models, but the result is more of a waste of time then a working computer.