I want to put short tube headers on my 5.2 truck. does anyone know a company that makes some that will bolt on in place of the stock manifolds without modifying anything and do the bolts on the old manifolds tend to ever come out if they've been in the truck 18 years

 

Any shorty header will work. Sometimes they do sometimes they don't. Use ARB header studs and Remflex gaskets to not get leaks

 

Used the ARP and Remflex AFTER I used the old bolts and cheap gaskets.

 

I used Stage 5 and Reflex on my headers.
No re-torquing, no leaks.