Dirko special sealant
Dirko Silicone Sealant is a high strength permanently elastic universal sealing compound that seals surfaces, gaps, and cracks. Stops leakage of oil, water, and air. Resistant to ozone, sunlight,extreme weather conditions, hot and cold water, sea water, greases, mineral oils, aliphatic hydrocarbons,detergents and others. Temperature range from -122F to +356F.
Yamabond® 4 Marine
A silicone-based liquid gasket that fills gaps on a flange surfaces, when cured (sets in 3 minutes), this product forms a rubber-like gasket that resists high temperatures and seals joints, oil resistant, Use where the service manual specifies "Threebond 1208 B"
I think all of the sealants mentioned are actually silicone based... Just make sure the one you choose is heat/fuel/oil resistant.
TFB