Headers

[Wi chevvy guy]

So i drove around for a week or 2 i kept thinking my 350 eng didnt sound right i crawl under hood and find 1 side of my headers so loose i moved the nuts with my fingers i tightened up all the bolts on headers and the difference is nite to day doesn't leaking headers effect gas milage rpms

 

[gotyourgoat]

Short answer yes.

Also the injected engines had o2 sensors so they would malfunction with the leak as well.

 

[Dutch Rutter]

A set of either these proform bolts of the lower stage 8 would fix this up and not allow them to loosen up. I've heard the stage 8 can be a pain, but I'm using the proform with good results.

https://www.summitracing.com/parts/...gKdQ1iou4DcoV2SuW9uBor4T-EkTSMC0aAuhvEALw_wcB

https://www.summitracing.com/parts/...NMNUU3CYpL05rcgin4PkDW88g8T1sRqYaAiQIEALw_wcB

 

[Wi chevvy guy]

Thx for the heads up dutch

 

[MikeB]

I simply use good gaskets like Fel-Pro steel-core 1404, 1444, 1405, etc. (depending on exhaust port size) along with ARP bolts with small flanges built into the bolt heads. I then re-tighten one time after a few hours of running. Can't remember the last time I had a bolt come loose. Also, I've always used headers with 5/16" or 3/8" flange thickness, vs. the cheapies with warp-prone 1/4" flanges.