First let me thank you both for your information. Sorry I forgot to mention the egine is a model 29-IV TV, which is for RC. I did take off the prop driver and there is no ball race behind it. This version has the square intake (venturi). Yep I got two cylinder heads with it. The information that was provided with the engine states... the head that came on the engine has a compression ratio of 5:1. the other has a compression ratio of 9:1.

Thanks again. I hope to have it up and running soon