The exhaust crossover is the center passage on your intake manifold (the runners with the paint cooked off) that allows hot gasses from the cylinder head exhaust passages to heat the carb plenum, producing faster warmups and less time running with the choke on.
In warmer climates, like SoCal, you can block off the passages between the heads and the intake manifold with an appropiate gasket like Mr. Gasket's #502 or Fel-Pro's # 1233, both of which contain metal backed plugs. This mod has the side benefit of permanently stopping the engine paint from burning off the intake crossover runners.
Les
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Les Iden
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'65 Buick Sport Wagon Custom, 340, T350, 3:23
'66 GTO Post/468, 700R4, 3.31 (Mike's as of 9-16)
'68 Grand Prix/455, dual AFBs, T400, 2:93 posi (sold)
'72 TA tribute/461, T400, 3.08, (Russ's as of 9-16)
'97 Mitsubishi Eclipse Spyder Turbo, Konis, 5 speed
'09 Torrent GXP, nav, Sun & Sound pkg., Bilsteins
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