i recently put hedman headers on my 1994 f150. for a couple days now ive been runing just open headers. i know that running open headers in cooler weather can warp my valves.. but in 2 days im dropping my truck off to put highflow cats on and 24 inch glass packs.. now heres where im worrying.. i have to have my truck for work tomorrow.. but its suposed to be really cold and snowing... will my valves be okay for tomorrow until i get the truck dropped off to complete my exhaust..?

 

theyre long tube headers if that makes a difference..

 

Race cars and hot boats run open or dry stack headers all the time..

Running open port isn't a good idea. Should be OK, but what about exhaust heat? Plenty of clearance?

 

Everything seemed fine to me when I put them..the only clearance issue I saw at all was the front drive shaft..but jegs specified that these headers were compatible with my truck so I guess its okay..

 

Meant more about exhaust out flow.. With open headers not putting too much heat on the floor or anything directly behind the flanges..

 

Intended more about fatigue out circulation . . . . . With open headers not placing too much warm on the ground or anything straight behind the flanges . . . . . . . .