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The old carbureted engines used a heat shroud around the 1 or 2 of the exhaust manifold exhaust primaries to give the carb some warm air almost immediately after startup.
This was just mostly so it would idle and not stall constantly right after a good cold startup.
The exhaust manifolds get real hot but its not very easy to get a high volume of really hot air off them.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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