How to properly seal nitro RC engine NO RTV!!! No more air leaks

I keep getting used engines of ebay with RTV sealant and its starting to bug me. Never use RTV, only in an EMERGENCY!!!. Seal it the right using gaskets.

Head warmer
https://www.amazon.com/gp/product/B00TNKEQK8/ref=as_li_tl?ie=UTF8&tag=fintechcomm0f-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B00TNKEQK8&linkId=697f133afd1e859a8506f9cf121be6f2