Other than sounding like a three dollar lawn mower there's not much advantage to running open headers if the engine is stock. You might get a tad more power out of it at the top of the RPM range. Stock 5.0's sound really sleazy with open headers and all you'd really be doing is making a lot of irritating noise. As for it hurting the engine, it probably won't hurt it. I've heard all my life that running an engine with open headers would cause burnt valves. I personally believe this is B.S. If this was true, there's be a major fortune to be made doing valve jobs at race tracks across the country every weekend.
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1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet.
Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.
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