[jrohner]

Carbureted race engines get this goo in the intake manifold runners. I never really looked down in the intake of my racecar to inspect anything, but I recently asked my engine builder and he said he's seen it before. The fuel is always bought in a drum and then mixed with gas to get a consistent mixture you can't get at the pump, usually premium fuel is what's added. I don't know if he has anyone running E98, never asked him, to see if it's the same with that. He also has engines running less than 85% ethanol, I should ask him if he's seen the goo in them at all.