Too hot for manifolds?

Hi. I recently purchased a heat gun to check how hot my 1970 Plymouth GTX car was running. The left manifold was running 779 and the right was 775. Is that too hot?

If that was right after a good hot run, then that's OK, if it was only at start up/warm up at idle, then that's a little hot...

I drove it about fifteen minutes getting into it. Is that still alright?

Yeah, sounds well within operating temps, using a hand held IR gun I'd get about 350-400 degrees F at idle full warm up in my Charger 440 on my stock HP exhaust manifolds, after a few hours cruising no more than 800-900 degrees F. but I have a Daytona, so they tend to run on the hot side easily because of the small grille opening...


Headers on the other hand tend to get up to 700 or so at warm up/idle and go upwards of 1200-1400 after some good run time depending on the tube size/coatings, the Chrome headers in my Challenger T/A get scary after a few hard runs, sometimes they're so hot and cherry red/orange it's scary, my IR only goes to 1650 F and I've pegged it a few times scanning them...

Mike

Thanks, Mike! I was a bit concerned. Gonna be keeping track the next few times, though, I take her out. Just curious to see each time how hot the exhaust manifolds get. Had a friend comment they seemed hot before using the hand held gun.

H.D. Diesel powered large trucks and piston powered gasoline aircraft engines use EGT, the red line on EGT senders before the turbos is 1450 F and similar on aircraft engines
700 to 1000 F on exhaust cast iron manifolds should be no sweat time