Heat
It’s one thing at modest speed. The draft takes the heat away. Stationary, the Chrysler V8 has 2 caspt iron exhaust manifolds weighing c 50meach. The cast iron takes ages to cool. Then the cast inlet manifoldq and the rest of the engine. It’s no wonder the heat builds up and explains why we see many Bristol’s on a hot day parked with the bonnet popped up. Add that huge Rotomaster to the mix and it’s no mystery that all that insulation has been added. I found that steel tubular manifolds were a good place to start.
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