350 TPI hot intake manifold

hi i just got an 85 firebird trans am, with a 91 camaro 350 TPI engine in it, and i wanted to know if it was normal that when i drive for about lets say 30 mins, to about 45 mins with it, or whatever lol enough time to get it warmed up and everything, i get out and when i touch the intake manifold its hot as hell!! like i cant even keep my hand on it, its burning...is this normal? if it is then this sucks loll power loss there 10 degrees = 1% HP and TQ

You mean the plenum is hot? Plenum is the upper part with the runners going down to the base which is the intake manifold.
The plenum is always hot for a very simple reason....convection. Heat rises AND aluminum is a very good conductor of heat.
Believe it or not, the inside of the plenum is no where near the temp of the outside since aluminum conducts heat so well. Also, the plenum isn't all that hot when you are moving and the engine is running, but when you stop and shut down, all of that cooling air flow in the engine bay is gone as is the cool air going down the plenum. Since the aluminum intake, runners & plenum sit on top of a cast iron block, they suck the heat from the iron quickly.

Thanks for your reply