Heat causes starter to freeze

[Cooper1972]

My grand dad just gave me his 72 sportvan, which he purchased new. He told me at times when its hot out, and the engine is hot (not overheated) the starter will freeze up due to the heat from the exhaust pipe which runs down next to the starter. It has a 350 engine. My question is does anyone know what I could use to insulate the starter from the exhaust pipe to keep the starter from over heating. He said in the winter it does not happen. My new van is in pristine condition and I love it.....Josh