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· TAKE A KID TO A CAR SHOW
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"upon shutdown, cold air can reach the valves and warp them especially if they are open (unseated from the head)." (thats an old wives tale) in my opinion!

Can't happen!!

overheating warps valves, caused from a lean condition! Not cold air reaching the valves!

Running off a header or open exhaust manifolds or zoom type headers or even right off the head exhaust ports won't warp valves from cooling too fast!
Glass packs bolted right to the header collectors would work to mellow the sound so would any muffler or resinators or chambered exhaust or just a long collector extention!
Jester
 
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