I'm contemplating on getting a set for my Z28. If not, then it's hello flowmasters! Anyway, my main concern is back pressure mainly, if I run them upcapped. Will I burn valves? I haven't been much into the chevy game myself (mostly Ford, Boooooooo!) and I don't know how the LT-1 is going to react to that setup (I'll still have my cats on but that's a question in itself). Is it going to be detremental if I run with open caps ALL the time? Thanks in advance everybody.

 

A good buddy of mine has a couple warlocks on his '81 347 Ford. They sound badass and you wont burn any valves. The LT1 runs fine with little back pressure.

If you have cats, then you should be FINE. If not then you still should be ok. There are plenty of people here running very unrestrictive exhaust.

 

Oh yeah, they're great on my LTD but I know that engine bolt by bolt and I haven't done much tooling on the LT-1 but I figured it would be okay. I'm still going to run cats unless I can find a way to get around IL's stupid emissions testing.