2003 CHEVROLET INCOMPLETE/CUTAWAY C3 Engine Problems

EXHAUST MANIFOLD BOLTS BROKE. 2 ON LEFT BANK, 1 ON RIGHT, DUE TO EXTREME HEAT IN ENGINE COMPARTMENT. MY MECHANIC SAYS THERE IS SO LITTLE ROOM FOR AIR TO CIRCULATE, AROUND THESE EXHAUST MANIFOLDS, THAT THEY GET RED HOT. WHEN THERE ARE WET ROADS, WATER MAY SPLASH UP IN THIS AREA AND CAUSE A FRACTURE ON THESE BOLTS AND MANIFOLDS. MY CONCERN IS THE SAFETY OF ALL THIS HEAT BUILD-UP IN THIS CONFINED AREA. MY VEHICLE IS A MOTORHOME, WITH 2-4 PEOPLE ON BOARD WHEN WE DRIVE IT. SHOULD I BE CONCERNED ABOUT IT CATCHING ON FIRE? WHAT IF I DRIVE 250 MILES, PULL OFF IN A REST STOP TO TAKE A NAP, AND IT CATCHES FIRE WHILE I'M SLEEPING IN IT? NOT TO MENTION THIS IS A $1000 FIX ON THIS ENGINE. I THINK CHEVROLET SHOULD DO SOMETHING ABOUT THIS PROBLEM. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF...