1970 Roadrunner 383 convertible 383 #5 exhaust port

[Bruce Meyer]

I have a 1970 Roadrunner 383 convertible that has exhaust port #5 twice as hot as all other ports. Any thoughts would be appreciated. Intake issue? Head gasket issue? Water jacket issue? I am going to adjust timing advance to see if that helps.

Thoughts please.

 

[RemCharger]

Is the heat riser valve stuck?

 

[steve340]

Burnt valve?

 

[BLK 68 R/T]

I’m gonna guess intake issue. Sucking air making that cylinder run leaner.

 

[Fran Blacker]

Anything neat #5 that would cause a vacuum leak? Cracked vacuum hose?

 

[vance.dykes]

the heat riser is good to check as said above. remember that the heat cross over come's thru there.

 

[Bruce Meyer]

Thanks. Going to start with intake and vac hoses first.