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Back pressure ???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Jan 9, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    How can you tell what is the proper back pressure? Reason being is that Im getting some free headers, with true dual exhuast from my father in law, from a screwed up order. So Im wondering if this new exhuast with running only dual cats, would I have proper back pressure on a stock 90 5.7lr 350?

    Will work for parts, beer and sex.
    90 Jimi,350/700R4/241/10bolts/3.73's/33's/4"
    <A target="_blank" HREF=http://mccordhouse.freeservers.com>http://mccordhouse.freeservers.com</A>
     
  2. Blaze

    Blaze 1/2 ton status

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    That shouldn't be a problem. Cats should restrict your exhaust enough to get the proper backpressure. I'm running Dynomax headers with true duals and a pair of Walker glasspacks with no cats on my 75 Firebird. It has a bone-stock 350 with a 2bbl and run fine(if only that darn choke wouldn't stick and the fuel pump wasn't going out on me)

    [​IMG]<A target="_blank" HREF=http://www4.ncsu.edu/~brschoch>http://www4.ncsu.edu/~brschoch</A>
     
  3. ftn96

    ftn96 1/2 ton status

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    Now, I'm talking about running just the cats, no mufflers. Still ok????

    Will work for parts, beer and sex.
    90 Jimi,350/700R4/241/10bolts/3.73's/33's/4"
    <A target="_blank" HREF=http://mccordhouse.freeservers.com>http://mccordhouse.freeservers.com</A>
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Well it'll be louder than hell, and I don't know if it'll be a nice sounding loud either. The cats will give you some backpressure but not much. Why don't you install some Flow-masters along with the cats?

    Rene

    [​IMG]
     
  5. ftn96

    ftn96 1/2 ton status

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    The only reason I was thinking of doing this was because I have stock exhuast now, but no muffler. Only running the cat and it sounds great. But I wasn't thinking that the headers are going to make it a little louder.

    Will work for parts, beer and sex.
    90 Jimi,350/700R4/241/10bolts/3.73's/33's/4"
    <A target="_blank" HREF=http://mccordhouse.freeservers.com>http://mccordhouse.freeservers.com</A>
     

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