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Exhaust manifold glowing?


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Last night i Drove my truck around my yard for the first time since I got the engine put in and when I stoped to open the shop door I looked back at the truck and the exhaust manifold was glowing so I shut the truck off and got my temp gun out it maxed out at 2500°F it looked almost translucent, what would cause this? The rest of the engine was at 200°F

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All valves were reseated but I haven't adjusted the tappets yet when the engines hot but I set them to .010 when it was cold, also the truck didn't have much power when I was driving it even though I could hit high RPM's, I'm up at school now I'll check the ignition timing when I'm back but it sounds like it's were it should be

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