Yikes, thats one huge engine. Maybe the fan isn't moving enough air? What type of fan(s) are you using?
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Kyle
 CANADIAN CONNECTION
'82 C10 Resto-Custom--> * 2 1/4" manifold back dual exhaust with Hooker Aerochambers & High Flow Cats *Taylor Ignition Wires *Centerline 15" Telstars with 32"x10" mudders
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