OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines What bolt size to mount a B&S engine

What is the bolt size required to mount this B&S engine? I tried M10 and it's not quite right. M8 definitely too small. Is it some sort of SAE size or odd thread?

They should be 3/8th UNC or you can get away with 3/8 Whit which is close

If remember correct the Briggs are unthreaded to start with they are 3/8 holes that they use self tappers. So if the new and never had screws in it then you just tapped to which 3/8 course thread that is easily available in your area provide you have the correct tap.