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That's where the exhaust crossover is on the intake. It could be a leaky intake gasket, but probably not, the exh. crossover area gets extremely hot, nearly as hot as your exhaust manifolds and will eventually burn off most engine paints.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
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