I have a question about the exhaust heat setup. I understand that there is pressure differential from one header to the other but it seems that it would pulse the gas back and forth unless there is a check valve to create one-way flow. I've never worked on something like this but I plan to set up my 250 this way and I'd like to understand it better.


'64 swb stepside (gone)
'57 1 ton
'53 phone truck
'59 swb
'46 1 1/2 ton
'68 swb gmc